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• February 20th, 2020, 23:20
Here is this week's POTW: ----- Let $n$ be the smallest positive integer such that $n$ is divisible by 20, $n^2$ is a perfect cube, and $n^3$...
0 replies | 66 view(s)
• February 20th, 2020, 23:08
Congratulations to Opalg for his correct solution(Cool), which you can find below: From the cosine rule in the triangle $BCD$, $$BD^2 = BC^2 +... 1 replies | 243 view(s) • February 20th, 2020, 20:18 You wrote (6 12 1) here. And you wrote (1 12 6) here. Shouldn't they be the same? (Wondering) Did you perhaps accidentally write... 28 replies | 355 view(s) • February 20th, 2020, 05:37 The original \pi_2 was already disjoint and contained (1 12 6). But it's not like that in both your cases, is it? (Worried) 28 replies | 355 view(s) • February 18th, 2020, 23:25 skeeter replied to a thread [SOLVED] 202 AP Calculus Inverse of e^x in Calculus the graph is close, but no cigar. f(1)=e \implies f^{-1}(e) =1 however, if f^{-1}(x)=\dfrac{1}{2}\ln{x}, then  f^{-1}(e) = \dfrac{1}{2}... 6 replies | 109 view(s) • February 18th, 2020, 17:57 skeeter replied to a thread [SOLVED] 202 AP Calculus Inverse of e^x in Calculus The inverse of f(x)=e^x is f^{-1}(x) = \ln{x} ... there is an obvious mistake in the answer choices. Maybe a typo? f(x) = e^{2x} ??? 6 replies | 109 view(s) • February 17th, 2020, 21:37 Probably the Islamia University of Bahawalpur in Pakistan. 4 replies | 4370 view(s) • February 16th, 2020, 15:17 my calculator’s CAS worked out these antiderivatives ... 4 replies | 164 view(s) • February 16th, 2020, 07:26 Hi Kristal, welcome to MHB! ;) There are 2 ways that are generally taught to do a substitution. You have the integral$$\int...
4 replies | 164 view(s)
• February 15th, 2020, 19:04
Looks like you did this (correct me if I'm mistaken) ... -7\int \dfrac{x^2}{\sqrt{4x-x^2}} \,dx = -7\int \dfrac{x^2}{\sqrt{x}\sqrt{4-x}} \,dx =...
4 replies | 164 view(s)
• February 15th, 2020, 09:43
Hi btekcan, Unfortunately MarkFL has been missing for a while. I don't think he'll see this question. I still am very hopeful that we'll see him...
15 replies | 3376 view(s)
• February 14th, 2020, 19:53
skeeter replied to a thread Scale Factor in Geometry
The dilation scale factor, which is a transformation, of triangle ABC to triangle DEF is 3/2 The scale ratio, like a map's scale, of triangle ABC...
5 replies | 165 view(s)
• February 14th, 2020, 18:52
skeeter replied to a thread Scale Factor in Geometry
perimeter of ABC : perimeter of DEF = 16:24 = 2:3
5 replies | 165 view(s)
• February 14th, 2020, 10:33
Let p(x)=2x^6+4x^5+3x^4+5x^3+3x^2+4x+2. Let \displaystyle I_{k}=\int^{\infty}_{0}\frac{x^k}{p(x)}dx where 0<k<5. Then value of k for which...
0 replies | 85 view(s)
• February 14th, 2020, 05:14
That is not enough, is it? If any pair $\pi_i$ and $\pi_j$ are cycles that overlap, the result won't hold. (Worried) However, if the cycles are...
5 replies | 187 view(s)
• February 13th, 2020, 22:39
Shouldn't the matrix be: \begin{pmatrix}0 & -1 & 0 \\ 1 & 0 & 0 \\ 0 & 0 & {\color{red}-\enclose{circle}{1}}\end{pmatrix} (Worried)
4 replies | 129 view(s)
• February 13th, 2020, 22:36
What do you mean by maximum length? (Wondering) I don't think this is true in general. Consider for instance $(1) \circ (1\,2) \circ... 5 replies | 187 view(s) • February 13th, 2020, 18:47 Hi again everyone, Latest update is I just met with a software developer who will handle some of the smaller migration details so we can make the... 8 replies | 1250 view(s) • February 13th, 2020, 04:50 Hey mathmari!! Is that a typo? Shouldn't it be$\pi^{-k}:=\left (\pi^k\right )^{-1}$? (Wondering) I don't think we need induction for 1.... 5 replies | 187 view(s) • February 13th, 2020, 04:33 The question only asks for a fixed vector. We know now that we need a vector perpendicular to the line of reflection. The line has an angle a with... 11 replies | 178 view(s) • February 12th, 2020, 23:33 Here is this week's POTW: ----- Let$ABCD$be a cyclic quadrilateral. The side lengths of$ABCD$are distinct integers less than 15 such that... 1 replies | 243 view(s) • February 12th, 2020, 23:19 Congratulations to the following members for their correct answer! 1. castor28 2. MegaMoh Solution from castor28: Let$q\$ be the ratio of the...
2 replies | 452 view(s)
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### 145 Visitor Messages

1. Hi
I've a question if you could help me with it, i'd be happy.

Question:
Expand and simplify the following set of brackets: f(x)=(x+2)(x+4)(x+1)

f(x)= ............ X3+………….. X2+…………………. X+11

regards
John
2. Thank you very much for the kind "Welcome" !!!
3. Hi. Thanks for the welcome. This is my first ever involvement in a forum. Not sure about the thread thing. I got a message when i first signed up that i had to reply to a thread before i posted my own? True?
4. thank you for the message I had a question regarding this website. how long does it usually take to get a response to something
5. Not to sure where to start. I have say a wire frame with 4 O/S perimeter measurements (measurements not even and is not square) 2 diagonal measurements 2 opposite points are low and the other 2 are higher I dont have the heights. My problem is I would like to find the centroid point and have the 4 new diagonal measurements to fill this in with 4 triangles of material. I want to do the Calculations in a spreadsheet as the measurements could change I think first off I need to work out the height ,work out all the horizontal measurements,work out the centroid of that then half the height and do the Pythagoras from that. I can give you my measurements that I have made up. Ive tried to do the maths in excel by flattening and find out the new bd using ac diagonal and finding the new ac using bd measurements but I was getting 2 different heights not by much 13 mm I know why but got lost. Hope you can understand where I going with this. This problem has been bugging me for years. Allan
6. how do I post my own problem I need help with?
7. Hi,

I need help for below solution

The height in inches of 10 students selected at random are as follows
61 62 62 65 66 67 68 69 69 70

on the basis of this figures is it correct to conclude that the mean height of students is 68 inches?
8. Thank you!
9. also can u pls suggest important questions of maths for class 12 2018 board for maths
10. sir i have a doubt in chapter 1 relations and functions example 23,24,25 of class 12 .please solve them boards are approaching
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#### February 17th, 2020

• 11:04 - anemone clicked Thanks for this post: -= Hidden Content =- by Opalg

#### February 15th, 2020

• 04:08 - Peter clicked Thanks for this post: -= Hidden Content =- by anemone

#### February 8th, 2020

• 00:55 - anemone clicked Thanks for this post: -= Hidden Content =- by MegaMoh

#### February 6th, 2020

• 11:25 - anemone clicked Thanks for this post: -= Hidden Content =- by castor28

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