# math- please help!

posted by anonymous

Please help with these 5 problems!
I have the solutions but I don't understand how to get them!

1. Perform the indicated operations and simplify:
[(2/x)-1]/(x^2 -4)

2. Subtract and simplify:
[12/(x^2 -4)] - [(3-x)/(x^2 + 2x)]

3. Perform the indicated operations and simplify:
[(x/y)-(y/x)]^-1

4. Divide and simplify:
[(a^2 b)/(a-b)]/[(a+b)/(a^2-b^2)]

5. Perform the indicated operations and simplify
[(x/x-3)-(2x/x^2-2X-3)]/[(2/x+1)-(1/x)

Solutions:

1. -1/(x^2 + 2x)

2. [x^2 + 7x + 6]/[x(x+z)(x-z)]
--typo in book?

3. xy/(x^2 - y^2)

4. a^2 b

5. x^2/(x-3)

1. drwls

1. Rewrite (2/x) -1 in the numerator as -(x-2)/x
Factor (x^2/4) in the denominator as (x-2)(x+2)
Then cancel out the (x-2) terms in numerator and denominator. You wil be left with -1/[x(x+2)]

3. Rewrite x/y and y/x with a common denominator, xy.
[(x^2- y^2)/xy]^-1 = xy/(x^2- y^2)

You try the others. They are all exercises in factoring and canceling tems

2. hhhhhhhhhhhh

8/9a^2 divide 4a^2-4a-24/a^2-6a+9 Perform the indicated operation

3. Modest

(2/3-1/6)divide by(1/4+4/5) reduce to lowes terms

4. Anonymous

idk edsgfjhdsh

## Similar Questions

1. ### Algebra

Please perform the indicated operations and simplify (3x-5)^2-(2x+1)(x-4)
2. ### Math

Could someone please explain this problem to me?
3. ### Math

Perform the indicated operations and simplify. (z-1)/(z-8)-(z+1)/(z+8)+(z-120)/(z^2-64) Solve (x+20)(x-12)(x+4)>0
4. ### Math

`Perform the indicated operations and simplify. (z-1)/(z-8)-(z+1)/(z+8)+(z-120)/(z^2-64)
5. ### Algebra

Can you please check my work? You have helped other students I know. Thank you:) Multiply -7(2a2 -4) = -14a2 + 28 Multiply 0.5(a + b -5) = 0.5a + 0.5b - 2.5 Factor bx - by + bz = b(x - y + z) Combine like terms (simplify) 12x + 4 -
6. ### Math

perform the indicated operations and simplify x-5/x-7-x-1/x+7+x-35/x^2-49
7. ### Math 141

I am having trouble with this problem. perform the indicated operations and simpily the result as much as possible a) (3x - 2) (x^2 + 2x - 4 ) the answer i got so far is 3x^3 + 4x^2 -16x + 8. Am i done or i have to conitnue to simplify?
8. ### Math

Perform the indicated operations and simplify: i^-31
9. ### math 117

perform the indicated operations and simplify z-4/z-6 - z+1/z+6 + z-30/z^2-36
10. ### college algebra

1. divide and simplify x^2+x-56/x^1-1 / x-7/2x+2 2. find the product in simplest from for x^2+x-6/2x^2-x-3 * x^7-2x^6+4x^5/x^4+8x 3. perform the indicated operations and simplify: 2/3x +4/3x^2 y^4 -6/2x^4 y^5 4. perform the indicated …

More Similar Questions