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HallsofIvy
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Yesterday,
23:09
MarkFL
replied to a thread
I can never get started on my Math homework.
in
Chat Room
Okay...well, when I was your age, I was no fan of doing homework either...I think very few middle school students are excited about doing homework....
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4 replies | 41 view(s)
Yesterday,
22:51
MarkFL
replied to a thread
I can never get started on my Math homework.
in
Chat Room
Hello, and welcome to MHB, I hate homework! (Wave) I moved your thread here, because our "Math Motes" forum is for threads of an...
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4 replies | 41 view(s)
Yesterday,
21:10
MarkFL
replied to a thread
Find m and n
in
Pre-Calculus
What I would do is from the given information, we know: x^2+mx+n=(x+3)^2 Expand the RHS, and then equate coefficients to determine $m$ and $n$....
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1 replies | 23 view(s)
Yesterday,
19:52
MarkFL
replied to a thread
Exponential Equation!
in
Pre-Algebra and Algebra
Hello and welcome to MHB, ScrewedIre! (Wave) We ask that our users show their progress (work thus far or thoughts on how to begin) when posting...
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1 replies | 16 view(s)
Yesterday,
19:22
MarkFL
replied to a thread
Need help with ratio problem!
in
Pre-Algebra and Algebra
Jackson got 30% of the votes, which is 3,696 votes. This means that together, Morris and Victor got the remaining 70%, which is 8,624 votes. Morris...
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1 replies | 22 view(s)
Yesterday,
19:05
MarkFL
replied to a thread [SOLVED]
242.17.8 Solve the given equation by variation of parameters.
in
Differential Equations
After almost 7 years of helping with math online, I think in $\LaTeX$ now. (Nerd) It really takes little time...and when I am posting a series of...
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4 replies | 83 view(s)
Yesterday,
14:55
MarkFL
replied to a thread
Solving Trig Identities
in
Pre-Calculus
Are you sure you've copied it correctly? It appears to me that the actual identity should be: ...
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2 replies | 37 view(s)
Yesterday,
10:02
MarkFL
replied to a thread
Factor "Crazy" Expression
in
Pre-Calculus
That's just a placeholder to make factoring a little easier...once you get more practice you won't need it. Also, it's part of how I choose to...
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4 replies | 66 view(s)
Yesterday,
09:48
MarkFL
replied to a thread
More and More Factoring
in
Pre-Calculus
You've dropped one of the 1's there...:D
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4 replies | 39 view(s)
Yesterday,
09:38
MarkFL
replied to a thread
More Factoring
in
Pre-Calculus
Yes, then combine like terms. :D
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4 replies | 44 view(s)
Yesterday,
02:24
MarkFL
replied to a thread
Factor "Crazy" Expression
in
Pre-Calculus
I would begin by using rational exponents in place of the radical notation: ...
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4 replies | 66 view(s)
Yesterday,
02:17
MarkFL
replied to a thread
Factoring With Negative Powers
in
Pre-Calculus
We are given to factor: \left(x^2+1\right)^{-\frac{2}{3}}+\left(x^2+1\right)^{-\frac{5}{3}} So, we factor out the expression with the smaller...
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2 replies | 43 view(s)
Yesterday,
02:08
MarkFL
replied to a thread
More and More Factoring
in
Pre-Calculus
When you factor out the expression $x^2+1$, you factor out the term having the smallest exponent (which you did), and then you subtract that exponent...
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4 replies | 39 view(s)
Yesterday,
02:02
MarkFL
replied to a thread
Irreducible Polynomial
in
Pre-Calculus
What does the discriminant tell you about the roots of this quadratic polynomial?
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7 replies | 76 view(s)
Yesterday,
01:58
MarkFL
replied to a thread
More Factoring
in
Pre-Calculus
No, you are given a difference of squares...:D
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4 replies | 44 view(s)
Yesterday,
01:56
MarkFL
replied to a thread
Factor: 64(x - a)^4 - x + a
in
Pre-Calculus
As a first step, I would write: 64(x-a)^4-x+a=64(x-a)^4-(x-a) Next factor out $x-a$, and the other factor will be the difference of cubes. :D
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2 replies | 37 view(s)
May 22nd, 2017,
19:07
MarkFL
replied to a thread
Vector Components
in
Geometry
I get: A_y=9.55\sin\left(-48^{\circ}\right)\text{ m}=-9.55\sin\left(48^{\circ}\right)\text{ m}\approx-7.10\text{ m} Your calculator is in...
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1 replies | 61 view(s)
May 22nd, 2017,
13:15
MarkFL
replied to a thread
high school inequality 3
in
Challenge Questions and Puzzles
It will be interesting to see the OP's solution. :)
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7 replies | 170 view(s)
May 22nd, 2017,
12:12
MarkFL
replied to a thread
Factor By Grouping
in
Pre-Calculus
Think of it like this: ...
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4 replies | 46 view(s)
May 22nd, 2017,
12:07
MarkFL
replied to a thread
Difference of Cubes?
in
Pre-Calculus
I applied the exponential property: x^ny^n=(xy)^n Since $8=2^3$, we can write: 8c^3=2^3c^3=(2c)^3
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4 replies | 57 view(s)
May 22nd, 2017,
12:02
MarkFL
replied to a thread
Factoring Fractional Expression
in
Pre-Calculus
It can be factored further, as there is both a sum and difference of cubes there. Bear in mind I only dealt with the numerator. :D
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4 replies | 53 view(s)
May 22nd, 2017,
00:51
MarkFL
replied to a thread
Factoring Fractional Expression
in
Pre-Calculus
Yes, in fact: ...
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4 replies | 53 view(s)
May 22nd, 2017,
00:45
MarkFL
replied to a thread
Factor Fractional Expression
in
Pre-Calculus
I would write the expression as the difference of squares: ...
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2 replies | 29 view(s)
May 22nd, 2017,
00:40
MarkFL
replied to a thread
Difference of Cubes?
in
Pre-Calculus
I would begin by writing the expression as the difference of cubes: (a+b)^3-8c^3=(a+b)^3-(2c)^3 Now apply the difference of cubes formula...:D
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4 replies | 57 view(s)
May 22nd, 2017,
00:37
MarkFL
replied to a thread
Factor By Grouping
in
Pre-Calculus
I would factor as follows: 8a^3+27b^3+2a+3b=(2a)^2+(3b)^3+2a+3b=(2a+3b)\left(4a^2-6ab+9b^2\right)+(2a+3b)=(2a+3b)\left(4a^2-6ab+9b^2+1\right) ...
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4 replies | 46 view(s)
May 22nd, 2017,
00:28
MarkFL
replied to a thread
Factor p^4 + 4
in
Pre-Calculus
If we allow for complex factors, then we can state: p^4+4=\left(p^2+2i\right)\left(p^2-2i\right) However, over the reals, the sum of two...
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5 replies | 74 view(s)
May 20th, 2017,
22:05
MarkFL
replied to a thread
4 Element by 4 Element Multiplication Table ...
in
LaTeX Help and Discussion
You need to wrap any $\LaTeX$ in dollar-sign delimiters, however then an error regarding the matrix m being unrecognized crops up, and I don't see...
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14 replies | 188 view(s)
May 20th, 2017,
21:31
MarkFL
replied to a thread [SOLVED]
242.17.8 Solve the given equation by variation of parameters.
in
Differential Equations
Let's first solve this ODE using the method of undetermined coefficients. We know the homogeneous solution is: y_h(x)=c_1e^{5x}+c_2xe^{5x} And...
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4 replies | 83 view(s)
May 20th, 2017,
19:16
MarkFL
replied to a thread [SOLVED]
242.17.8 Solve the given equation by variation of parameters.
in
Differential Equations
Your fundamental solution set for the corresponding homogeneous equation is: \left\{e^{5x},xe^{5x}\right\} So now we take as our particular...
see more
4 replies | 83 view(s)
May 20th, 2017,
16:42
HallsofIvy
replied to a thread
Apples
in
Basic Probability and Statistics
If it is possible that some of the people get no apples, then there are 5 choices who to give the first apple to, 5 choices who to give the second...
see more
4 replies | 91 view(s)
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May 22nd, 2017
00:13 -
RTCNTC
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Re: Total Price Per Ticket
by
HallsofIvy
Tickets at a fair cost...
May 20th, 2017
17:33 -
RTCNTC
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Re: Apples
by
HallsofIvy
If it is possible that...
May 19th, 2017
08:52 -
RTCNTC
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Re: Probability of Turning into a Bird
by
HallsofIvy
I can see that...
May 17th, 2017
16:10 -
RTCNTC
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Re: More Factoring
by
HallsofIvy
Because it was...
May 16th, 2017
00:46 -
karush
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Re: 17.2.9 Solve the given equation by the method of undetermined coefficients
by
HallsofIvy
ok going to see if i can...
May 14th, 2017
23:16 -
RTCNTC
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Re: Square Root vs Cube Root
by
HallsofIvy
The product of two...
23:03 -
RTCNTC
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Re: Approximation for π and sqrt{2}
by
HallsofIvy
Say whether each...
22:33 -
MarkFL
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Re: Square Root vs Cube Root
by
HallsofIvy
The product of two...
May 13th, 2017
16:09 -
MarkFL
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Re: Volume of Shipping Box
by
HallsofIvy
I'm sure that MarkFL is...
May 12th, 2017
19:17 -
Harpazo
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Re: Mass and Center of Mass
by
HallsofIvy
To find the mass (using...
08:53 -
Ackbach
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Re: Mass and Center of Mass
by
HallsofIvy
To find the mass (using...
May 11th, 2017
21:09 -
Harpazo
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Re: Mass and Center of Mass
by
HallsofIvy
You don't need to...
15:39 -
evinda
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Re: Is the solution unique?
by
HallsofIvy
What you have isn't "of...
May 10th, 2017
23:57 -
Harpazo
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Re: Find Mass & Center of Mass
by
HallsofIvy
Surely, you realized...
09:39 -
MarkFL
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Re: Differentiation of infinite series
by
HallsofIvy
Find derivative of...
May 9th, 2017
17:19 -
evinda
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Re: Method of seperation of variables
by
HallsofIvy
Hello!!! (Wave) I...
May 7th, 2017
12:46 -
MarkFL
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Re: Radius of Gyration
by
HallsofIvy
Yes, it is. The "radius...
12:46 -
MarkFL
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Re: Center of Mass
by
HallsofIvy
Imagine being able to...
11:01 -
Harpazo
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Re: Center of Mass
by
HallsofIvy
Imagine being able to...
11:00 -
Harpazo
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Re: Radius of Gyration
by
HallsofIvy
Yes, it is. The "radius...
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