4. Ifis a root of the quadratic equation x2+ lo, nd the value of k – InterviewSolution

1.

4. Ifis a root of the quadratic equation x2+ lo, nd the value of k

Answer»

Plug 1/2 in for x, then solve for k

(1/2)² + k(1/2) - 5/4 = 0

1/4 + 1/2k - 5/4 = 0

1/2k + (1/4 - 5/4) = 0

1/2k - 1 = 0

1/2k = 1

k = 2

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