Q. For the following equation, what is the instantaneous rate of change at x=1 ?f(x)=−2x5+2x2−5Answer:
Identify function and point: Identify the function and the point at which the instantaneous rate of change is required.The function given is f(x)=−2x5+2x2−5, and we need to find the instantaneous rate of change at x=1.
Calculate derivative of function: Calculate the derivative of the function f(x). The derivative of f(x) with respect to x is f′(x)=dxd(−2x5)+dxd(2x2)−dxd(5). Using the power rule, the derivative of −2x5 is −10x4, the derivative of 2x2 is 4x, and the derivative of a constant is 0. So, f′(x)=−10x4+4x.
Evaluate derivative at x=1: Evaluate the derivative at x=1 to find the instantaneous rate of change at that point.Substitute x=1 into the derivative f′(x) to get f′(1)=−10(1)4+4(1).This simplifies to f′(1)=−10+4.
Calculate final instantaneous rate: Calculate the final value of the instantaneous rate of change at x=1.f′(1)=−10+4=−6.
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