Need help with two Algebra 2 problems >_<

 Answers!

Okay, you take Fiel's and butterfli's thing, and you have:

X [or A, which Fiel used] = a+b
Y [or B] = a-b

(X^3 + Y^3)(X^3 - Y^3)

X^3 + Y^3 = (X + Y)(X^2 - XY + Y^2)
X^3 - Y^3 = (X - Y)(X^2 + XY + Y^2)

And you combine them:

(X + Y)(X^2 - XY + Y^2)(X - Y)(X^2 + XY + Y^2)

Then you substitute X and Y for their original terms:

(a+b+a-b)((a+b)^2-(a+b)(a-b)+(a-b)^2)(a+b-(a-b))((a+b)^2+(a+b)(a-b)+(a-b)^2)

Simplify till the end.

2a(a^2+ab+b^2-(a^2-b^2)+a^2-ab+b^2)(a+b-a+b)(a^2+ab+b^2+a^2-b^2+a^2-ab+b^2)

2a(a^2+ab+b^2-a^2+b^2+a^2-ab+b^2)(a+b-a+b)(a^2+ab+b^2+a^2-b^2+a^2-ab+b^2)

2a(a^2+ab+b^2-a^2+b^2+a^2-ab+b^2)(a+b-a+b)(a^2+ab+b^2+a^2-b^2+a^2-ab+b^2

2a(a^2+3b^2)2b(3a^2+b^2)

4ab(a^2+3b^2)(3a^2+b^2)