Q. Find the derivative of the following function.y=e−3x3−7x2Answer: y′=
Identify function: Identify the function to differentiate.The function given is y=e(−3x3−7x2). We need to find the derivative of this function with respect to x.
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 eu and the inner function is u=−3x3−7x2.
Differentiate outer function: Differentiate the outer function with respect to the inner function u. The derivative of eu with respect to u is eu. So, the derivative of the outer function is e(−3x3−7x2).
Differentiate inner function: Differentiate the inner function u=−3x3−7x2 with respect to x. The derivative of −3x3 with respect to x is −9x2, and the derivative of −7x2 with respect to x is −14x. Therefore, the derivative of the inner function is −9x2−14x.
Apply chain rule multiplication: Apply the chain rule by multiplying the derivative of the outer function by the derivative of the inner function.The derivative of the outer function is e(−3x3−7x2), and the derivative of the inner function is −9x2−14x. Multiplying these together gives us the derivative of y with respect to x.y′=e(−3x3−7x2)×(−9x2−14x)
Simplify derivative: Simplify the expression for the derivative.y′=−9x2⋅e(−3x3−7x2)−14x⋅e(−3x3−7x2)This is the final form of the derivative.
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