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• Today, 03:13
Here is this week's POTW: ----- Find the exact value for the real root of the equation $x^3+3x-2=0$. ----- Remember to read the POTW...
0 replies | 27 view(s)
• Today, 02:59
Congratulations to the following members for their correct solution::) 1. kaliprasad 2. lfdahl Honorable mention goes to cmath123, as he has his...
1 replies | 107 view(s)
• Yesterday, 02:29
MarkFL replied to a thread 231.14.88 3d surface in Calculus
Multiplying through by $9+6x-8y$ and distributing the $26$, we obtain -x^2-y^2+z^2=156x-208y+234 -x^2-156x-y^2+208y+z^2=234 ...
3 replies | 53 view(s)
• February 15th, 2017, 20:29
You have two points on the graph, so you can compute the slope as follows: m=\frac{\Delta y}{\Delta x}=\frac{y_2-y_1}{x_2-x_1} Then, you can...
2 replies | 58 view(s)
• February 14th, 2017, 23:47
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. :)
4 replies | 89 view(s)
• February 14th, 2017, 23:18
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...
4 replies | 89 view(s)
• February 14th, 2017, 22:17
Let's try your substitution of: u=x+9\implies du=dx I=\int_9^{18}\frac{(u-9)^3}{u^2}\,du By the binomial theorem: ...
1 replies | 47 view(s)
• February 14th, 2017, 12:31
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:
2 replies | 100 view(s)
• February 12th, 2017, 22:44
Yes, those are typically how these two metrics for the center of the data are used. So it comes down to how do we define "having outliers"? In real...
7 replies | 149 view(s)
• February 12th, 2017, 00:21
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...
3 replies | 105 view(s)
• February 11th, 2017, 18:00
Jameson replied to a thread Election in Pre-Algebra and Algebra
Hi there. :) Look at the part in red to start with. This kind of issue comes up a lot with word problems. We know that the ratio of purple...
2 replies | 59 view(s)
• February 11th, 2017, 17:56
Hi rebo1984, What rules and guidelines have you been given to decide? In general I agree with your answers. The median is less sensitive to...
7 replies | 149 view(s)
• February 10th, 2017, 11:34
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...
3 replies | 112 view(s)
• February 10th, 2017, 10:27
MarkFL replied to a thread Line y = (x/2) + 3 in Pre-Calculus
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
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}+(k-1)x_n
1 replies | 73 view(s)
• February 9th, 2017, 15:50
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.
12 replies | 187 view(s)
• February 9th, 2017, 12:36
Here is this week's POTW: ----- Given that $\sqrt{x^3+1648}-\sqrt{4949-x^3}=75$ for $x\in\Bbb{N}$. Find $x$. ----- Remember to read the...
1 replies | 107 view(s)
• February 9th, 2017, 12:26
No one answered last week's problem.(Sadface) You can find the suggested solution as follows: Let...
1 replies | 138 view(s)
• February 9th, 2017, 03:49
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...
12 replies | 187 view(s)
• February 9th, 2017, 02:15
That's not quite right: x=\frac{-(-y)\pm\sqrt{(-y)^2-4(1)(-y^2)}}{2(1)}=y\frac{1\pm \sqrt{5}}{2} Discarding the negative root, we obtain: ...
12 replies | 187 view(s)
• February 9th, 2017, 00:25
To solve for $x$ here, we let: a=1 b=-y c=-y^2
12 replies | 187 view(s)
• February 8th, 2017, 20:14
I think there is probably a mental peak of our lives, but that doesn't mean that anyone is ever too old to pursue math. When I was 18 I was a...
8 replies | 173 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...
8 replies | 173 view(s)
• February 8th, 2017, 11:27
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...
12 replies | 187 view(s)
• February 8th, 2017, 10:13
While there's technically nothing wrong with what you did, I would evaluate as follows: I=\int_{120}^{995}...
4 replies | 102 view(s)
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### 4 Visitor Messages

1. Hello and welcome back to MHB, paulmdrdo!

We are happy to see that you have returned, and we look forward to your continued participation here!

On Behalf Of MHB's Staff,

anemone.
2. Hello and welcome back to MHB, paulmdrdo!

We are happy to see that you have returned, and we look forward to your continued participation here!

On Behalf Of MHB's Staff,

Jameson.
3. Hello paulmdrdo,

We ask (as per forum rule #16) that math questions be posted in the appropriate sub-forum. I recommend posting this in the pre-calculus forum. This way, all members have a chance to read your problem and offer help, and it contributes to the knowledge base of our site.

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Mark.
4. Hello and welcome to MHB, paulmdrdo!

I am so pleased you accepted my invitation to join!

If you have any questions or comments about the forums, please feel free to address them to me or another staff member. We are happy to help, and look forward to your participation here!

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