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Simplifying
Multiply two binomials that each contain a square root by applying the FOIL method, then simplify and combine the four resulting products.
Apply FOIL to obtain four products:
- First:
- Outer:
- Inner:
- Last:
Write all four products:
Combine the constant terms: . Combine the like radical terms: .
When FOIL is applied to binomials containing square roots, the Last product often involves a square root multiplied by itself, which yields an integer (here ). The Outer and Inner products are typically like radicals that can be combined, just as they would be like terms in standard polynomial multiplication.
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