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OpenStudy (anonymous):
Solve the equation by graphing: x2 – 18x + 81 = 0. A. {-2, 9} B. {9/2, 3} C. {9} D. No solution
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Directrix (directrix):
C. {9} x2 – 18x + 81 = 0 (x-9)(x-9) = 0 x = 9 or x = 9 --> double root, point of tangency on x-axis
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