College Algebra / Alg 070 · Atom · ~20 seconds

Squaring a Binomial

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Squaring a binomial produces a perfect square trinomial: (a + b)² = a² + 2ab + b², middle term included.

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(x + 4)² runs FOIL on (x + 4)(x + 4): x² + 4x + 4x + 16 = x² + 8x + 16.

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The middle term 2ab is the whole point.