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Choose and Verify a Quadratic Solution Method
Grade Level
ACCUPLACER
AAF.048 Choose and Verify a Quadratic Solution Method
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Which choice is the strongest plan for sqrt(2x + 15) = x - 3: the efficient method and the real solution(s) that check?
A
Square both sides and keep every candidate; x = 4 - sqrt(22) or x = 4 + sqrt(22).
B
Square both sides, solve the quadratic, and check; x = 4 + sqrt(22).
C
Use factoring; x = -3 or x = 5.
D
Use the quadratic formula without checking; x = -4 - sqrt(22) or x = -4 + sqrt(22).
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