Squaring a Binomial
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State
Squaring a binomial produces a perfect square trinomial: (a + b)² = a² + 2ab + b², middle term included.
Show
(x + 4)² runs FOIL on (x + 4)(x + 4): x² + 4x + 4x + 16 = x² + 8x + 16.
Watch for
The middle term 2ab is the whole point.
Builds on
- Nothing — this is a starting point.
Unlocks
- Nothing yet depends on this.