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Evgeny.Makarov
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Today,
11:04
MarkFL
replied to a thread
Find Perimeter of Rectangle
in
Pre-Calculus
When I was a student, I found one of the best ways to understand things is to look at them in general terms. For example, in this problem, rather...
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21 replies | 164 view(s)
Today,
10:49
MarkFL
replied to a thread
Find Perimeter of Rectangle
in
Pre-Calculus
What we see is that we must have: L=W And so, what we have found is that for a rectangle of a given area, the perimeter is the smallest it can...
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21 replies | 164 view(s)
Today,
10:34
MarkFL
replied to a thread
Find Perimeter of Rectangle
in
Pre-Calculus
Your next step should be: (L-W)^2=0 So, how must L and W be related in order for this to be true?
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21 replies | 164 view(s)
Today,
10:28
MarkFL
replied to a thread
Two Pieces of Wire
in
Pre-Calculus
No, what we want is: A\left(W_1\right)+A\left(W_2\right)>5 A(x)+A(12-x)>5 Now, the arguments for the area function represent wire lengths,...
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10 replies | 67 view(s)
Today,
10:10
MarkFL
replied to a thread
Two Pieces of Wire
in
Pre-Calculus
Yes, now we need to answer the question: For which values of x will the combined areas of the squares exceed 5 cm^2? We have two pieces of wire...
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10 replies | 67 view(s)
Today,
10:00
MarkFL
replied to a thread
Two Pieces of Wire
in
Pre-Calculus
Okay, you have a piece of wire whose length is let's say W...you bend it into a square...what is the perimeter of the square? Then using your formula...
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10 replies | 67 view(s)
Today,
09:55
MarkFL
replied to a thread
Find Perimeter of Rectangle
in
Pre-Calculus
Yes, once you simplify, you will find the implication. :D
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21 replies | 164 view(s)
Today,
09:53
MarkFL
replied to a thread
Quadratic Inequality...4
in
Pre-Calculus
Yes, now combine terms on the LHS...:D
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4 replies | 33 view(s)
Today,
09:44
MarkFL
replied to a thread
Two Pieces of Wire
in
Pre-Calculus
Let's use x for the length of the sides of the square, so we have: P=4x A=x^2 Now, we want to replace x in the formula for the area with an...
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10 replies | 67 view(s)
Today,
09:39
MarkFL
replied to a thread
Find Perimeter of Rectangle
in
Pre-Calculus
You're just seeing what the equation implies about the relationship between L and W. :D
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21 replies | 164 view(s)
Yesterday,
23:01
Peter
started a thread
[
]
Splitting Fields: Anderson and Feil, Theorem 45.6 ...
in
Linear and Abstract Algebra
I am reading Anderson and Feil - A First Course in Abstract Algebra. I am currently focused on Ch. 45: The Splitting Field ... ... I need...
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0 replies | 12 view(s)
Yesterday,
22:50
MarkFL
replied to a thread
Find Perimeter of Rectangle
in
Pre-Calculus
We have: \sqrt{LW}\le\frac{L+W}{2} When I ask "when does equality occur," I am essentially asking you to solve: \sqrt{LW}=\frac{L+W}{2} ...
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21 replies | 164 view(s)
Yesterday,
21:56
MarkFL
replied to a thread
206.07.05.88 partial fractions???
in
Calculus
I would look at a substitution like: u=\sqrt{x^2+4x+3}\implies dx=\frac{u}{x+2}\,du And the integral then becomes: I=\int\frac{1}{u^2+1}\,du
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1 replies | 24 view(s)
Yesterday,
19:33
MarkFL
replied to a thread
Two Pieces of Wire
in
Pre-Calculus
What is the area $A$ of a square whose perimeter is $P$?
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10 replies | 67 view(s)
Yesterday,
19:25
MarkFL
replied to a thread
Quadratic Inequality...4
in
Pre-Calculus
You don't want to multiply an inequality by an expression whose sign is unknown...arrange everything to one side and then get your critical values...
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4 replies | 33 view(s)
Yesterday,
19:21
MarkFL
replied to a thread
Quadratic Inequality...3
in
Pre-Calculus
You are assuming x is positive when you do that. A better step is to subtract x/2 from both sides: \frac{2}{x}-\frac{x}{2}<0 Combine terms: ...
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2 replies | 30 view(s)
Yesterday,
15:00
MarkFL
replied to a thread
Quadratic Inequality
in
Pre-Calculus
Yes, we have a parabola opening upwards, and given that it has two real roots, we should expect to find it to be negative in between its roots. :D
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7 replies | 68 view(s)
Yesterday,
14:44
MarkFL
replied to a thread
I have mathematics problems for solving but i can not understand how to solve these mathematics?
in
Pre-Calculus
Okay, I have several issues here: 1.) We ask that you post no more than 2 questions per thread: 2.) You've shown no effort:
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1 replies | 62 view(s)
Yesterday,
13:38
MarkFL
replied to a thread
Quadratic Inequality...2
in
Pre-Calculus
In this problem, you have a function representing a parabola that opens upwards. We should then expect, given that it has two real roots, that the...
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7 replies | 72 view(s)
June 22nd, 2017,
22:28
Peter
replied to a thread
Galois Theory - Fixed Field of F and Definition of Aut(K/F) ...
in
Linear and Abstract Algebra
Thanks Euge ... that helped in a big way ... Most grateful for your help and support ... Peter
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2 replies | 61 view(s)
June 22nd, 2017,
22:26
Peter
replied to a thread
Splitting Fields: Anderson and Feil, Theorem 45.4
in
Linear and Abstract Algebra
Thanks Euge ... Appreciate all your help ... Peter
see more
6 replies | 64 view(s)
June 22nd, 2017,
22:23
Peter
started a thread
[
]
Splitting Fields: Anderson and Feil, Theorem 45.5
in
Linear and Abstract Algebra
I am reading Anderson and Feil - A First Course in Abstract Algebra. I am currently focused on Ch. 45: The Splitting Field ... ... I need...
see more
0 replies | 25 view(s)
June 22nd, 2017,
14:34
MarkFL
replied to a thread
Adding Vectors (Final review)
in
Geometry
If we know the magnitude $M$ of a vector $\vec{v}$, and the direction $\theta$ in which it points, then we may express the vector in component form...
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5 replies | 113 view(s)
June 22nd, 2017,
13:47
MarkFL
replied to a thread
Find Perimeter of Rectangle
in
Pre-Calculus
Let's examine a general rectangle...using the AM - GM inequality we may state: \sqrt{LW}\le\frac{L+W}{2} When does equality occur? Given...
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21 replies | 164 view(s)
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Showing Friends 1 to 9 of 9
June 17th, 2017
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daniel felipe
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re: Demonstration of set operation
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Evgeny.Makarov
Hi, and welcome to the...
June 15th, 2017
09:27 -
HallsofIvy
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Re: Test for Symmetry
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Evgeny.Makarov
On this forum you are...
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Re: Test for Symmetry
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On this forum you are...
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Re: Test for Symmetry
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Evgeny.Makarov
On this forum you are...
June 13th, 2017
10:11 -
MarkFL
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Re: Find An Equation...4
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Evgeny.Makarov
Find an equation of the...
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RTCNTC
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Re: Find An Equation...4
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Find an equation of the...
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RTCNTC
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Re: Find An Equation...3
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Evgeny.Makarov
Yes, you are correct....
June 12th, 2017
16:07 -
RTCNTC
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Re: Prove the Given Statement...2
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In post #10 I wrote the...
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Evgeny.Makarov
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Re: Prove the Given Statement...2
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greg1313
I am not sure what you...
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MarkFL
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Re: Prove the Given Statement...2
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Going back to the...
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MarkFL
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Re: Prove the Given Statement...2
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I know nothing about...
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RTCNTC
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Re: Prove the Given Statement...2
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I know nothing about...
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MarkFL
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Re: Prove the Given Statement...2
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Mark is offering you a...
June 10th, 2017
12:17 -
MarkFL
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Re: Intervals On Number Line
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We are talking about...
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Re: Intervals On Number Line
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Can you demonstrate why...
June 9th, 2017
14:39 -
RTCNTC
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Re: Intervals On Number Line
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You are claiming that...
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RTCNTC
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Re: Intervals On Number Line
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1. | x | < 2 ...
June 6th, 2017
16:20 -
Yankel
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Re: Partial Order Relation where the Set is not Necessarily Finite
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I might have missed the...
June 4th, 2017
16:01 -
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Re: Common Core Mathematics
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Common Core Method: ...
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