Question

if the roots of quadratic equation x²+4x-8d are equal, find d​

Answer 1

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when roots are equal,discriminant is 0

$discriminant= {b}^{2} - 4ac \\ 0= {4}^{2} - 4(1)(8d) \\ 0 = 4 - 32d \\ 0 - 4 = 32d \\ d = \frac{ - 4}{32} \\ d = \frac{ - 1}{8} ans$