Q. For the following equation, evaluate f′(1).f(x)=−4x5+4xAnswer:
Given Function: Given the function f(x)=−4x5+4x, we need to find the derivative of the function, which is denoted by f′(x). The derivative of a function gives us the rate at which the function's value changes at any given point.
Power Rule Application: To find f′(x), we will use the power rule for differentiation, which states that the derivative of xn with respect to x is n∗x(n−1). We will apply this rule to each term in the function separately.
Derivative of −4x5: Differentiating the first term −4x5 with respect to x, we get −4×5×x(5−1)=−20x4.
Derivative of 4x: Differentiating the second term 4x with respect to x, we get 4×1×x(1−1)=4.
Combining Derivatives: Combining the derivatives of both terms, we get f′(x)=−20x4+4.
Evaluate at x=1: Now we need to evaluate f′(x) at x=1. So we substitute x with 1 in the derivative we found: f′(1)=−20(1)4+4.
Simplify and Final Result: Simplifying the expression, we get f′(1)=−20(1)+4=−20+4=−16.
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