1. I have three math problems that I need help with. I have the solutions but I do not know how they got them. If anyone can help that would be great. None of my friends seem to be able to help me and every web site that I have been to wants money. I don't want to pay for a tutor just to get three problems answered. Because I cannot write them out as mathematical equations on this site I am writing it out in words in hopes that you can help me.

1. if xy is not equal to 0 and x is not equal to y and x is not equal to -y then
(3/y - 3/x) / 1/y^2 - 1/x^2 = ?
(the ^2 means to the 2nd power in case you did not know)

2. what is the square root of: 2^1 + 2^2 / 2^3 (the entire problem has a square root symbol over)

3. ab-c = cb and a is not equal to c then b=

Again if you can help I would greatly appreciate it. I could not make the sign for not equal to that is why I wrote it out. I have learned over three months of Algebra in a little over a week, and I have greatly improved my scores, but I still have trouble with problems like these that don't seem to make any rational sense. Thank you again for any help you can give me.

oh and the answers that I was given for these problems are:

1. 3xy/x+y
2. square root of 3 over 2
3. b= c/a-c or b= c over a-c

I got the answers from an online algebra calculator, but it would not tell me how it got the answers and so it did not help me any
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Joined: Jul '10; Posts: 35; Likes: 5

3. All the problems are a matter of simplifying the equations. Can you describe the problems you are having? For each question, describe how you are trying to solve the problems.
4. Quote from frogger32091
I have three math problems that I need help with. I have the solutions but I do not know how they got them. If anyone can help that would be great. None of my friends seem to be able to help me and every web site that I have been to wants money. I don't want to pay for a tutor just to get three problems answered. Because I cannot write them out as mathematical equations on this site I am writing it out in words in hopes that you can help me.

1. if xy is not equal to 0 and x is not equal to y and x is not equal to -y then
(3/y - 3/x) / 1/y^2 - 1/x^2 = ?
(the ^2 means to the 2nd power in case you did not know)

2. what is the square root of: 2^1 + 2^2 / 2^3 (the entire problem has a square root symbol over)

3. ab-c = cb and a is not equal to c then b=

Again if you can help I would greatly appreciate it. I could not make the sign for not equal to that is why I wrote it out. I have learned over three months of Algebra in a little over a week, and I have greatly improved my scores, but I still have trouble with problems like these that don't seem to make any rational sense. Thank you again for any help you can give me.

oh and the answers that I was given for these problems are:

1. 3xy/x+y
2. square root of 3 over 2
3. b= c/a-c or b= c over a-c

I got the answers from an online algebra calculator, but it would not tell me how it got the answers and so it did not help me any

1.
i would solve for x or y, then substitute to solve for the other.

2.
2^1 + 2^2 / 2^3 (the entire problem has a square root symbol over)
= 2^1 + 2^(-1) (the entire problem has a square root symbol over)
=2 + 1/2 (the entire problem has a square root symbol over)
= 5/2 (the entire problem has a square root symbol over)
sorry, but for the way your question is written, the answer is (5/2)^1/2
it gives me a headache to figure out what you meant to write. srry

3.
ab-c = cb
ab-cb = c
b(a-c) = c
b = c / (a-c)
(or if you want to simply further, you would factor out the c to get c(1/(a-1)) = (c/a) - (c/1) = (c/a) -c
5. Check out http://www.brightstorm.com/math. It's a free site with tons of really helpful videos that walk you through all sorts of math problems. There are lots of examples of each type of problem, and they explain things really well.
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