Question

Use FOIL to find the product.
(2x^5 -9)(x^8 -1)=

Answer 1

FOIL

First
Outside
Inside
Last

First = 2x^5 times x^8 = 2x^13
Outside = 2x^5 times -1 = -2x^5
Inside = -9 times x^8 = -9x^8
Last = -9 times -8 = 72

Now add up all the terms:

2x^13 - 2x^5 - 9x^8 + 72

There are no "like terms" (same powers of x) so we are done. :)