if for the function f(x) = kx^2 +7x-4 , f'(5) =97 find k

We have :     fx = kx2+7x-4f'x = 2kx + 7Now, f'5 = 2k × 5 + 7 = 10k + 7     f'5 = 9710k+7 = 9710k = 90k = 9

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