math- please help!

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:

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

5. Perform the indicated operations and simplify


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)

asked by anonymous
  1. 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

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

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

    posted by Modest
  4. idk edsgfjhdsh

    posted by Anonymous

Respond to this Question

First Name

Your Answer

Similar Questions

  1. 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
  2. Algebra 2

    Subtract. Simplify by removing a factor of 1 when possible. (9p^b)/p^2-b^2 - p-b/p+b. Thank you. These problems, I don't understand at all. I'm sorry.
  3. Algebra

    1. Subtract and simplify 18/y-8 - 18/8-y 2. subtract simplify if possible v-5/v - 7v-31/11v 3. Simplify by removing factors of 1 r^2-81/(r+9)^2 4. Divide and simplify v^2-16/25v+100 divided by v-4/20 5. find all rational numbers
  4. 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
  5. math check

    Simplify each rational expression. 3a(a-4)^2 over a^2(a-4) I don't understand how the answer would be 3(a-4) over a because the a-4 would cancel out??? 4-y^2 over y^2-2y once I simplify I get (2-y)(2+y) over (y-2)(y+2) I don't
  6. Math

    Perform the indicated operations and simplify: i^-31
  7. Math

    perform the indicated operations and simplify x-5/x-7-x-1/x+7+x-35/x^2-49
  8. math

    Needing help with these problems lost, subtract. simplify if possible 3/x-9 - 3/ 9-x, divide and simpliify 6/t divide 18/t, add. simplify is possible 5/z-8 + 12/(z-18)^2
  9. Math

    `Perform the indicated operations and simplify. (z-1)/(z-8)-(z+1)/(z+8)+(z-120)/(z^2-64)
  10. math 117

    perform the indicated operations and simplify z-4/z-6 - z+1/z+6 + z-30/z^2-36

More Similar Questions