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If you had to multiply two binomials together such as (a+b) and (c+d), how would you keep track of the resulting products to make sure that you have multiplied everything and not left anything out.
Think of FOIL
First, Outer, Inner, Last
So that (a+b)*(c+d) = ac(first) + ad(outer) + bc(inner) +bd(last)
Thanks to bibliophage for providing that mnemonic.
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