How do you FOIL #(s^2+t)(s^2+t)#?

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Answer 1 · 2018-03-18T02:19:46

#s^4+2s^2t+t^2#

When you #FOIL# a set of factors (also called double distributing), we follow these steps:

#F# - First
#O# - Outer
#I# - Inner
#L# - Last

It may seem confusing with just variables, and the fact that the #s# is squared, but it works all the same.

After following the steps given by the acronym, we get:

#s^4+s^2t+s^2t+t^2#

Here we just combine like terms and get:

#s^4+2s^2t+t^2#