Let f(x) = root x. If the rate of change of f at x = c is twice its rate of change at x=1, then c=...? i have no idea what to do.
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Originally Posted by abcocoa Let f(x) = root x. If the rate of change of f at x = c is twice its rate of change at x=1, then c=...? i have no idea what to do. Hello, the rate of change is calculated by the first derivative: Now calculate f'(1) = 1/2. That means you know now the value of the rate of change at c: It is 1. Therefore solve the following equation for c: . I've got EB
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