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karush
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Yesterday,
03:49
karush
replied to a thread
231.14.88 3d surface
in
Calculus
thank you that was very helpful new stuff for me.
see more
3 replies  53 view(s)
Yesterday,
02:29
MarkFL
replied to a thread
231.14.88 3d surface
in
Calculus
Multiplying through by $9+6x8y$ and distributing the $26$, we obtain x^2y^2+z^2=156x208y+234 x^2156xy^2+208y+z^2=234 ...
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3 replies  53 view(s)
Yesterday,
00:10
karush
started a thread
231.14.88 3d surface
in
Calculus
$ \tiny{231.14.88}\\$ $\textsf{Identify and briefly describe the surface of the equation}\\$ \begin{align*}...
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3 replies  53 view(s)
February 15th, 2017,
20:29
MarkFL
replied to a thread
linear relationship question
in
PreAlgebra and Algebra
You have two points on the graph, so you can compute the slope as follows: m=\frac{\Delta y}{\Delta x}=\frac{y_2y_1}{x_2x_1} Then, you can...
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2 replies  58 view(s)
February 14th, 2017,
23:47
MarkFL
replied to a thread
derivative and tangent curves
in
Calculus
Yes, the derivative of the function evaluated at the $x$coordinate of the tangent point will give you the slope $m$ of the tangent line. :)
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4 replies  89 view(s)
February 14th, 2017,
23:18
MarkFL
replied to a thread
derivative and tangent curves
in
Calculus
The first derivative of a function gives you the slope of the tangent line, not the tangent line itself. Thus,for some function $f(x)$, the tangent...
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4 replies  89 view(s)
February 14th, 2017,
22:17
MarkFL
replied to a thread
Q58.5.17 int of rational expression..
in
Calculus
Let's try your substitution of: u=x+9\implies du=dx I=\int_9^{18}\frac{(u9)^3}{u^2}\,du By the binomial theorem: ...
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1 replies  47 view(s)
February 14th, 2017,
19:46
karush
started a thread
Q58.5.17 int of rational expression..
in
Calculus
$\tiny{Q58.5.17}$ $\textsf{Evaluate}$ \begin{align*}\displaystyle I&=\int_0^{9}\frac{x^3 \, dx}{x^2+18x+81} \color{red}{=243\ln2162}...
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1 replies  47 view(s)
February 14th, 2017,
17:01
karush
replied to a thread [SOLVED]
242t.8.5.9 expand the quotient by partial fractions
in
Calculus
here is what I did but your method better... expand and multiply every term by $(3+5x)(35x)$} \begin{align*}\displaystyle...
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3 replies  63 view(s)
February 14th, 2017,
14:59
karush
started a thread [SOLVED]
242t.8.5.9 expand the quotient by partial fractions
in
Calculus
$\tiny{242t.8.5.9}$ $\textsf{expand the quotient by}$ $\textbf{ partial fractions}$ \begin{align*}\displaystyle y&=\int\frac{dx}{925x^2}...
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3 replies  63 view(s)
February 14th, 2017,
12:31
MarkFL
replied to a thread
Rational function equation problem solving
in
PreAlgebra and Algebra
Just to follow up, we left off with: 8\frac{15000}{x}=5 Arrange as: 3=\frac{15000}{x} Multiply through by \frac{x}{3}\ne0:
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2 replies  100 view(s)
February 12th, 2017,
00:21
MarkFL
replied to a thread
Conditional Expectation problem
in
Advanced Probability and Statistics
Yes, we use $\LaTeX$ powered by MathJax, which is what you'll find on most other math sites. The only difference is, unlike other sites, we provide...
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3 replies  105 view(s)
February 10th, 2017,
11:36
karush
replied to a thread [SOLVED]
8.3.8 int sin^5 (3x) dx
in
Calculus
sorry everyone I made some typos in this so I'll just close the post.
see more
3 replies  97 view(s)
February 10th, 2017,
11:34
MarkFL
replied to a thread
Point (a, b) Reflected About Two Lines
in
PreCalculus
Let's generalize the method I posted >>>here<<< to reflect a given point $(a,b)$ about the line $y=mx+k$, where ($m\ne0$). We will call the reflected...
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3 replies  112 view(s)
February 10th, 2017,
10:27
MarkFL
replied to a thread
Line y = (x/2) + 3
in
PreCalculus
Another way to show 3 points are collinear is to pick two distinct pairs from the 3 points, and show that the slope between both pairs is the same. :D
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2 replies  55 view(s)
February 10th, 2017,
00:30
MarkFL
replied to a thread
Square root Convergence
in
Calculus
To extend the ladder for $\sqrt{k}$, you want: x_{n+1}=x_n+y_n y_{n+1}=x_{n+1}+(k1)x_n
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1 replies  73 view(s)
February 9th, 2017,
16:41
karush
started a thread [SOLVED]
8.3.8 int sin^5 (3x) dx
in
Calculus
$\tiny{8.3.8}$ $\textit{evaluate}$ \begin{align*}\displaystyle I_{8}&=\int_{0}^{\pi/4} \sin^5{2x},dx\\ &=\int_{0}^{\pi/4} (\sin^2(2x))^2...
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3 replies  97 view(s)
February 9th, 2017,
15:50
MarkFL
replied to a thread
Line Segment AB...Challenge Question
in
PreCalculus
Now necessarily...for example if we multiply through by $k$, we get: k+1=k^2 And BOOM! we have question 1 of part B) done.
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12 replies  187 view(s)
February 9th, 2017,
03:49
MarkFL
replied to a thread
Line Segment AB...Challenge Question
in
PreCalculus
We don't need to solve for $y$. We need only to have shown that: \frac{x}{y}=\frac{1+\sqrt{5}}{2} to satisfy part A) of the problem. For part...
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12 replies  187 view(s)
February 9th, 2017,
02:15
MarkFL
replied to a thread
Line Segment AB...Challenge Question
in
PreCalculus
That's not quite right: x=\frac{(y)\pm\sqrt{(y)^24(1)(y^2)}}{2(1)}=y\frac{1\pm \sqrt{5}}{2} Discarding the negative root, we obtain: ...
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12 replies  187 view(s)
February 9th, 2017,
00:25
MarkFL
replied to a thread
Line Segment AB...Challenge Question
in
PreCalculus
To solve for $x$ here, we let: a=1 b=y c=y^2
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12 replies  187 view(s)
February 8th, 2017,
18:23
karush
replied to a thread [SOLVED]
242t.08.02.09 int of rational expression.
in
Calculus
thanks love the tips...
see more
4 replies  102 view(s)
February 8th, 2017,
12:06
MarkFL
replied to a thread
Age Limit for Math Degree
in
Chat Room
Perhaps, but they will just have to deal with it as they will learn to do with many things they might find "a little odd" as they learn about the...
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8 replies  173 view(s)
February 8th, 2017,
11:27
MarkFL
replied to a thread
Line Segment AB...Challenge Question
in
PreCalculus
I think the problem should state: "The point P is located on line segment AB in such a way that AB/AP = AP/PB" If we use the given hint, then...
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12 replies  187 view(s)
February 8th, 2017,
10:13
MarkFL
replied to a thread [SOLVED]
242t.08.02.09 int of rational expression.
in
Calculus
While there's technically nothing wrong with what you did, I would evaluate as follows: I=\int_{120}^{995}...
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4 replies  102 view(s)
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karush
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November 24, 1944 (72)
About karush
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Wahiawa, Hawaii
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retired from Architecture and Surveying
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February 18th, 2017
16:37 
karush
clicked Thanks for this post:
Re: 231.14.88 3d surface
by
HallsofIvy
Strictly speaking, it is...
04:21 
MarkFL
clicked Thanks for this post:
Re: 231.14.88 3d surface
by
karush
thank you that was very...
03:46 
karush
clicked Thanks for this post:
Re: 231.14.88 3d surface
by
MarkFL
Multiplying through by...
February 14th, 2017
23:14 
greg1313
clicked Thanks for this post:
Re: 242t.8.5.9 expand the quotient by partial fractions
by
karush
here is what I did but...
18:27 
topsquark
clicked Thanks for this post:
Re: 242t.8.5.9 expand the quotient by partial fractions
by
karush
here is what I did but...
17:07 
MarkFL
clicked Thanks for this post:
Re: 242t.8.5.9 expand the quotient by partial fractions
by
karush
here is what I did but...
17:02 
karush
clicked Thanks for this post:
Re: 242t.8.5.9 expand the quotient by partial fractions
by
topsquark
$\tiny{242t.8.5.9}$ ...
February 10th, 2017
11:32 
karush
clicked Thanks for this post:
Re: 8.3.8 int sin^5 (3x) dx
by
Prove It
$\tiny{8.3.8}$...
February 8th, 2017
20:02 
MarkFL
clicked Thanks for this post:
Re: 242t.08.02.09 int of rational expression.
by
karush
thanks love the tips...
18:23 
karush
clicked Thanks for this post:
Re: 242t.08.02.09 int of rational expression.
by
Prove It
$\tiny{242t.08.02.09}$...
18:23 
karush
clicked Thanks for this post:
Re: 242t.08.02.09 int of rational expression.
by
MarkFL
While there's...
February 6th, 2017
18:28 
karush
clicked Thanks for this post:
Re: 242.7x.27 Find the slowest growing and the fastest growing functions
by
HallsofIvy
$\displaystyle...
February 4th, 2017
20:41 
karush
clicked Thanks for this post:
Re: 242t.08.02.41 Find the area of the region bounded by
by
MarkFL
$\tiny{242t.08.02.41}$...
February 3rd, 2017
00:05 
karush
clicked Thanks for this post:
Re: 242.7x.19 d/dx arctan(sqrt(3x))
by
Prove It
$\tiny{242.7x.19}$ ...
00:02 
karush
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Re: 242.7x.13 Solve the differential equation
by
MarkFL
it might be preferable...
February 2nd, 2017
16:55 
karush
clicked Thanks for this post:
Re: 242.7x.13 Solve the differential equation
by
MarkFL
\begin{align*}\displaysty...
January 31st, 2017
09:23 
karush
clicked Thanks for this post:
Re: 242.7x.14 decay prob...
by
MarkFL
The percentage of $C$...
January 30th, 2017
22:40 
karush
clicked Thanks for this post:
Re: 242.7x.25 trig dx
by
MarkFL
We could use a table of...
January 28th, 2017
22:56 
karush
clicked Thanks for this post:
Re: 242.7x.27 Find the slowest growing and the fastest growing functions
by
greg1313
$\displaystyle...
22:27 
karush
clicked Thanks for this post:
Re: int trig subst
by
greg1313
$$I=\color{red}\frac12\co...
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