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MarkFL
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Today,
01:36
MarkFL
replied to a thread
Long over-arrow ...
in
Math Formulas (MathJax)
Hello, Peter! (Wave) This code: \overrightarrow{f(a)f(x)} produces: \overrightarrow{f(a)f(x)}
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3 replies | 52 view(s)
October 20th, 2018,
01:03
MarkFL
replied to a thread
Synthetic division with Latex
in
Math Formulas (MathJax)
In our \(\LaTeX\) Live Preview, there is a "Begin/End" button you can click, and choose "Synthetic Division" from the dropdown menu, and follow the...
see more
2 replies | 75 view(s)
October 16th, 2018,
22:43
MarkFL
replied to a thread
Plotting Polar Equations and converting to rectangular equations
in
Pre-Calculus
Okay, we are given the polar equation: r=6\cos(\theta) Now, from: x=r\cos(\theta)\implies \cos(\theta)=\frac{x}{r} We may write:
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1 replies | 92 view(s)
October 16th, 2018,
22:20
MarkFL
replied to a thread
quadratic functions
in
Pre-Calculus
Hello, and welcome to MHB! (Wave) Let's first look at a graph of the two given functions and the given points: From the graph, it appears...
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1 replies | 79 view(s)
October 16th, 2018,
15:05
MarkFL
replied to a thread
How to solve Chinese Remainder Theorem
in
Number Theory
I have edited your post to remove the blank space above and below the content, and to remove the personal information for your protection.
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11 replies | 238 view(s)
October 15th, 2018,
15:31
MarkFL
replied to a thread
convert another equation to polar form
in
Pre-Calculus
We see we have a circle centered at the origin, and in polar coordinates, that's simply a constant value for \(r\). The Cartesian equation: ...
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3 replies | 110 view(s)
October 15th, 2018,
15:11
MarkFL
replied to a thread
Triviality vs. Intuition
in
Linear and Abstract Algebra
Generally speaking, I certainly would not say the two terms are interchangeable, or synonymous.
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9 replies | 202 view(s)
October 15th, 2018,
15:05
MarkFL
replied to a thread
convert equation to polar form
in
Pre-Calculus
At this point, I would recommend you speak to the professor, and let him/her know what you've done.
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10 replies | 210 view(s)
October 15th, 2018,
15:02
MarkFL
replied to a thread
convert another equation to polar form
in
Pre-Calculus
You need to also square the trig. functions: x^2+y^2=4 (r\cos(\theta))^2+(r\sin(\theta))^2=4 r^2\cos^2(\theta)+r^2\sin^2(\theta)=4 Factor...
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3 replies | 110 view(s)
October 15th, 2018,
14:37
MarkFL
replied to a thread
convert equation to polar form
in
Pre-Calculus
Perhaps it wants: \theta=\frac{\pi}{4}(4k+1)
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10 replies | 210 view(s)
October 15th, 2018,
14:33
MarkFL
replied to a thread
convert equation to polar form
in
Pre-Calculus
Any Cartesian line of the form: y=ax will correspond to a polar equation of the form: \tan(\theta)=a or:
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10 replies | 210 view(s)
October 15th, 2018,
13:36
MarkFL
replied to a thread
convert equation to polar form
in
Pre-Calculus
If you divided through by \(r\), you have: \tan(\theta)=1 What does this imply for \(\theta\)?
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10 replies | 210 view(s)
October 13th, 2018,
21:41
MarkFL
replied to a thread
Consensus on "homework questions"
in
Questions, Comments, and Feedback
It was very recently discussed among staff that greeting a new user, who likely isn't familiar with our goal to guide rather than provide complete...
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1 replies | 112 view(s)
October 13th, 2018,
21:27
MarkFL
replied to a thread
Find a,b,c,d given max and min in cubic function
in
Calculus
I used a CAS to solve the system, but if I were to do it by hand, let's look at the four equations: a+b+c+d=-4\tag{1} -8a+4b-2c+d=1\tag{2} ...
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4 replies | 167 view(s)
October 13th, 2018,
19:33
MarkFL
replied to a thread
Find a,b,c,d given max and min in cubic function
in
Calculus
Hello, and welcome to MHB! (Wave) We know two points on the curve, so we may write: f(1)=a(1)^3+b(1)^2+c(1)+d=a+b+c+d=-4 ...
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4 replies | 167 view(s)
October 13th, 2018,
13:44
MarkFL
replied to a thread
Finding costs prior to finance charges
in
Pre-Algebra and Algebra
Hello, and welcome to MHB! (Wave) I re-titled your thread so that the title reflects the question being asked. So, let's walk through this...
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1 replies | 79 view(s)
October 12th, 2018,
14:15
MarkFL
replied to a thread
My professor never even covered this problem
in
Pre-Calculus
It appears that Evgeny's post was quoted after he wrapped his code in math tags. I wasn't aware though that the issue of inline LaTeX bleeding into...
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15 replies | 352 view(s)
October 12th, 2018,
13:47
MarkFL
replied to a thread
My professor never even covered this problem
in
Pre-Calculus
Are you using a mobile device?
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15 replies | 352 view(s)
October 8th, 2018,
19:49
MarkFL
replied to a thread [SOLVED]
triple chain rule
in
Calculus
Check your signs on the LHS. :)
see more
10 replies | 618 view(s)
October 8th, 2018,
19:29
MarkFL
replied to a thread
Evaluating cos((1/2)arccos(x))
in
Pre-Calculus
The first thing I would consider is: 0\le\arccos(x)\le\pi Hence: 0\le\frac{1}{2}\arccos(x)\le\frac{\pi}{2} This means the cosine of the...
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1 replies | 172 view(s)
October 8th, 2018,
15:27
MarkFL
replied to a thread [SOLVED]
triple chain rule
in
Calculus
You can't treat \(y\) as a constant, because it is a function of \(x\). You need to use the chain rule. :)
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10 replies | 618 view(s)
October 7th, 2018,
19:32
MarkFL
replied to a thread [SOLVED]
triple chain rule
in
Calculus
I think I might square and arrange as: y^2-7x=\sqrt{7x+\sqrt{7x}} At this point you could implicitly differentiate w.r.t \(x\) and solve for...
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10 replies | 618 view(s)
October 7th, 2018,
19:14
MarkFL
replied to a thread
214 related rates gravel cone
in
Calculus
Gravel is being dumped from a conveyor belt at a rate of 30\,\frac{\text{ft}^3}{\text{min}} This tells us, if we let all measures of length be in...
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2 replies | 409 view(s)
October 7th, 2018,
13:45
MarkFL
replied to a thread
Bisector properties
in
Geometry
It seems to me to be similar to asking if, for any particular number, are there multiple values that are half of that number. For example, we know 6...
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4 replies | 179 view(s)
October 6th, 2018,
16:18
MarkFL
replied to a thread
Inequality with fractions
in
Pre-Algebra and Algebra
What I would do is divide the real number line into the following intervals (based on the critical values, the strength of the inequality and...
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9 replies | 157 view(s)
October 6th, 2018,
14:49
MarkFL
replied to a thread
Inequality with fractions
in
Pre-Algebra and Algebra
Okay I did miss that, but that still leads to the same critical values and is a needless move.
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9 replies | 157 view(s)
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October 22nd, 2018
10:40 -
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Guidelines for posting/answering a challenging problem or puzzle
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MarkFL
Hello Everyone, This...
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Re: Long over-arrow ...
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MarkFL
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October 21st, 2018
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Re: Conundrums
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Jameson
Not a math proof per...
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MarkFL
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Conundrums
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Let me start this thread...
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Re: Synthetic division with Latex
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MarkFL
What's the best way to...
October 20th, 2018
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Re: Synthetic division with Latex
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What's the best way to...
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Re: Synthetic division with Latex
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MarkFL
What's the best way to...
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Re: Synthetic division with Latex
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MarkFL
What's the best way to...
October 18th, 2018
14:17 -
MarkFL
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Re: Infinitesimal = number?
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Why infinitesimal is a...
October 17th, 2018
23:18 -
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Re: quadratic functions
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MarkFL
Hello, and welcome to...
11:32 -
MarkFL
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Problem Of The Week #336 Oct 17th, 2018
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Here is this week's...
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Congratulations to the...
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Re: quadratic functions
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Hello, and welcome to...
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Okay, we are given the...
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Hello, and welcome to...
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Okay, we are given the...
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Problem of the Week #280 - Oct 16, 2018
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