SOLUTION: Factor completely. If prime, say so. a. 40x^3-64x^2y b. 125r^3-8s^3

Algebra ->  Divisibility and Prime Numbers -> SOLUTION: Factor completely. If prime, say so. a. 40x^3-64x^2y b. 125r^3-8s^3       Log On


   

Question 318589: Factor completely. If prime, say so.
a. 40x^3-64x^2y
b. 125r^3-8s^3
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
40x%5E3-64x%5E2yi start with the variables first
x%5E2%2840x-64y%29 then factor a 4 out
4x%5E2%2810x-16%29 then factor out the 2
8x%5E2%285x-8%29


i see the cube but i dont think i can factor it correctly
5%5E3r%5E3-2%5E3s%5E3
be something like
%28%285r%2B2s%29%285r-2s%29%29%285r%2B2s%29 but this doesnt seem to come out right when foiled