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:

$s^4+2s^2t+t^2$

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