FOIL is an acronym for
First Outer Inner Last
used when multiplying binomials.
1. Multiply the FIRST terms in each binomail. In this problem that would be
x^(1/2) * x^(1/2)
2. Multiply the OUTER terms:
x^(1/2) * 4
3. Multiply the INNER terms:
-2 * x^(1/2)
4. Multiply the LAST terms in each binomial:
-2 * 4
Then add all the like like terms.
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