# Search results

1. ### Help with these two questions

Hello, I was working on a math assignment and I got stuck on these two questions: 7. Solve: Sqrt(2x+25) - 2 Sqrt(x+4) = 1 I know the answer is 0 but I don't know how to remove the Square roots without ending up that x somehow equals 20. 8. Solve: { x +2y =16 { {...
2. ### Can someone explain this question to me?

Hey, I've been doing this pre-calculus assignment and I ran into this Question: "Find the equation of the set of all points (x,y) such that the absolute value of the difference between their distance to (-3,0) and to (3,0) is 4." What do they mean? I'm certain I can do it but I have no idea...
3. ### Find the Equation of this Ellipse

Hi, I'm having a huge amount of trouble with this question: "Write the equation of an ellipse centered at the origin that has a horizontal major axis e = 1/2 and 2c=1" First off, what is "2c=1" I have never seen this before, is it telling me that c = .5? that makes no sense though, because e =...
4. ### Finding the Irrational roots of this Equation

Hi, I was given the following question and I've been working on it for hours and I have no idea how to solve it due to it having no Rational roots. Find all possible roots to the nearest tenth for: 6x3+6x2+15x-2=0 Can I get some advice on where to even start? I tried Synthetic Division, long...
5. ### Rational Equality Question

Hi, I was given the following question: Solve the equation. Check your Solution. \displaystyle{\dfrac{1}{2a-2}=\dfrac{a}{a^2-1}+\dfrac{2}{a+1}} So I get the LCD: (2a-2)(a+1)(a-1) Start canceling...
6. ### Composite function Question

Hi, I've been doing Pre-Calculus by Correspondence for a little while now, and after a while everything was going fine, but now I'm having trouble with the following composite Function question: F(x) = (3x)/(x^2 + 3x + 2), g(x) =(5x)/(x+1) simplified expression for (f•g)(x), I get about as far...
7. ### Help finding the maxima and minima

Hi, I'm sorry but I need help with calculus again. I've been doing pretty good ever since I started doing graphing, but this question is has got me stumped as what to do next: find the intervals of increase. use the first derivative test to find the local maxima and minima. sketch a rough...
8. ### Help understanding this sequence.

So I got this sequence in my homework and I just don't understand what I'm supposed to do since it's unlike any sequence I've ever seen. the question is as follows: a1=4, a2=3, an=3an-1+2an-2, n>2, n∈N Find the first 5 terms. at first I thought an=3an-1+2an-2 would work so that for say a3...
9. ### Can someone explain mathematical induction to me?

Yeah... I know it's sad, but I don't understand it, I'm doing math by correspondence and I don't have anyone to help me with it, I've watched up like 10 videos and at least read four guides but I still don't get it. I've been in this calculus for 2 weeks now and I figured I skip it and coast...
10. ### Help with sequences

I did a pre-calculus assignment and I recently got it back, I was told to do it over again because I failed it because I did not show my work. I'm doing pre-calculus by correspondence. (which I hate BTW, since I have no one to ask for help) Anyway.... the question is as follows: t3+t4=36...
11. ### Limit Help: (x - 1)/(sqrt(x) - 1) as x -> 1

I have the same problem as this one (which is how I found this site in the first Place). http://www.freemathhelp.com/forum/threads/45882-Limit-Help-(x-1)-(sqrt(x)-1)-as-x-gt-1 After reading through the help (which seemed to help that guy, but I'm still confused) I don't know what to do, can...