Q. Find the derivative of the following function.y=95x3+4x2Answer: y′=
Identify Components: Identify the components of the function.The function y=95x3+4x2 is an exponential function where the base is a constant (9) and the exponent is a polynomial (5x3+4x2).
Apply Chain Rule: Apply the chain rule for differentiation.The chain rule states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function. In this case, the outer function is 9u and the inner function is u=5x3+4x2.
Differentiate Outer Function: Differentiate the outer function with respect to the inner function.The derivative of 9u with respect to u is (9u⋅ln(9)). We will later substitute u with the inner function.
Differentiate Inner Function: Differentiate the inner function with respect to x. The inner function is u=5x3+4x2. The derivative of 5x3 with respect to x is 15x2, and the derivative of 4x2 with respect to x is 8x. Therefore, the derivative of the inner function is u′=15x2+8x.
Apply Chain Rule Multiplication: Apply the chain rule by multiplying the derivatives of the outer and inner functions.Using the chain rule, the derivative of y with respect to x is y′=(95x3+4x2⋅ln(9))⋅(15x2+8x).
Simplify Derivative: Simplify the expression for the derivative. y′=(95x3+4x2⋅ln(9))⋅(15x2+8x) is already simplified, and there is no further simplification needed.
More problems from Find derivatives of radical functions