Question

Simplify: (a^2-b^2)/(a^3-b^3). My answer was (a+b)/(a^2-ab+b^2). What did I get wrong?

Answer 1

diff of squares over diff of cubes

Answer 2

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

(a+b)
---------------
(a^2 +ab +b^2) <- watch your signs

Answer 3

ohhh now I see thanks!

Answer 4

:)