Q. Find the derivative of the following function.y=e−6x2+9xAnswer: y′=
Identify function: Identify the function to differentiate.y=e(−6x2+9x)
Recognize composition: Recognize that this is a composition of functions: the exponential function and a quadratic function. The outer function is eu, and the inner function is u(x)=−6x2+9x.
Find derivative outer function: Find the derivative of the outer function with respect to u, where u=−6x2+9x.If v=eu, then v′=eu⋅dxdu.
Find derivative inner function: Find the derivative of the inner function u(x)=−6x2+9x with respect to x.u′(x)=dxd(−6x2+9x)=dxd(−6x2)+dxd(9x)=−12x+9.
Apply chain rule: Apply the chain rule, which 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.y′=eu⋅u′(x) where u=−6x2+9x and u′(x)=−12x+9.
Substitute into derivative: Substitute u and u′(x) into the derivative of the outer function.y′=e(−6x2+9x)∗(−12x+9).
Simplify final answer: Simplify the expression to get the final answer.y′=(−12x+9)e(−6x2+9x).
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