Solving Quadratic Equations: Completing the Square — Unit test

Question 4 • Common Core Algebra I 2014 - MA3109 B-CR

Which equation results from taking the square root of both sides of (x – 9)2 = 81?

Answer

x – 9 = ±9

x + 9 = ±9

x + 3 = ±9

x – 3 = ±9

Taking the square root of both sides of (x − 9)² = 81 gives x − 9 = ±√81. Since √81 = 9, the result is x − 9 = ±9, which is choice A.

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