Q. For the following equation, evaluate f′(5).f(x)=4x2+3xAnswer:
Identify Function: Identify the function to differentiate.We are given the function f(x)=4x2+3x and we need to find its derivative, denoted by f′(x).
Differentiate Function: Differentiate the function f(x) with respect to x. To find f′(x), we use the power rule for differentiation, which states that the derivative of xn with respect to x is n⋅x(n−1). Differentiating 4x2 with respect to x gives us 2⋅4x(2−1)=8x. Differentiating 3x with respect to x gives us x1. So, x2.
Evaluate Derivative: Evaluate the derivative at x=5.We substitute x=5 into the derivative f′(x) to find f′(5).f′(5)=8(5)+3=40+3=43.
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