Completing the Square
Solve the equation using square roots. Check your solution(s). 1. x2 + 4x + 4 = 36 2. x2 − 6x + 9 = 1 3. x2 − 22x + 121 = 81 In Example 1, the expression x2 − 16x + 64 is a perfect square trinomial because it equals (x − 8)2. Sometimes you need to add a term to an expression x2 + bx to make it a perfect square trinomial.
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