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posted by Branden Tuesday, August 23, 2011 at 12:58pm.
Find the instantaneous rate of change of y with respect to x when x = 15 for the function y = 5x2 − 2x
I think you meant to type y = 5x^2 - 2x if so, then dy/dx = 10x - 2 and if x = 15 dy/dx = 10(15) - 2 = 148
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