Question

Find the product. (4x-y)^3

Answer 1

http://www.wolframalpha.com/input/?i=expand+%284x-y%29^3

Answer 2

Use the formula
\[
(a-b)^3=a^3-3 a^2 b+3 a
b^2-b^3
\]

Answer 3

a=4x
b=y

Answer 4

You will get
\[
(4 x-y)^3=64 x^3-48 x^2 y+12 x
y^2-y^3
\]