posted by erin on .
my post is still on this page as algebra, could someone elaborate on what bobpursley tried to help me with.
See your original post.
I am guessing you are referring to your question
and your answer= 25x^2 - 16
= 25x^2 - 20x - 20x + 16
= 25x^2 - 40x + 16
The FOIL that bobpurseley was referring to means
F - multiply the firsts
O - multiply the outside terms
I - multiply the inside terms
L - multiply multiply the last terms
it is a short memory-aid to help you multiply two binomials