1. ## Simplifiying help!

Perform the indicated operations and simplify. (Note: The answers should have no negative exponents)

1) (3mn^2 + 2mn - 3m^2n^2) - (3m^2n - 6mn^2) - (m^2n - 6m^2n^2)

2) 2x (A+B)y - (A+B)y^2 / 8(A+B)

2. Originally Posted by Draft
Perform the indicated operations and simplify. (Note: The answers should have no negative exponents)

1) (3mn^2 + 2mn - 3m^2n^2) - (3m^2n - 6mn^2) - (m^2n - 6m^2n^2)
First thing you want to do is distrubute those negatives signs...doing that, you'll get

$\displaystyle mn^2 + 2mn - 3m^2n^2 - 3m^2n + 6mn^2 - m^2n + 6m^2n^2$

Now, you should group like terms...m squared, n squareds go together, m squared ns should go together...so on

$\displaystyle 6m^2n^2 - 3m^2n^2 - 3m^2n - m^2n + 6mn^2 + 3mn^2 + 2mn$

Now, combine like terms

$\displaystyle [6m^2n^2 - 3m^2n^2] [- 3m^2n - m^2n] [+ 6mn^2 + 3mn^2] + 2mn$

gets

$\displaystyle 3m^2n^2 - 4m^2n + 9mn^2 + 2mn$

2) 2x (A+B)y - (A+B)y^2 / 8(A+B)
$\displaystyle 2x(A+B)y - (A+B)\frac{y^2}{8}(A+B)$ or
$\displaystyle 2x(A+B)y - \frac{(A+B)y^2}{8(A+B)}$