Question

write y=(x+2)(x+1)(x-1) in expanded (foil) form

Answer 1

Notice we have (x+1)(x-1), which gives \[x^2-1\]
Now multiply this by (x+2), gives \[(x^2-1)(x+2) = x^3+2x^2-x-2\]

Answer 2

thanks again man, your the best!

Answer 3

anytime mate :)