Q. Find the derivative of the following function.y=9−x2Answer: y′=
Identify function: Identify the function to differentiate.We have y=9(−x2). This is an exponential function with a base of 9 and an exponent of −x2.
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. Here, the outer function is 9u and the inner function is u=−x2.
Differentiate outer function: Differentiate the outer function with respect to the inner function u. The derivative of 9u with respect to u is 9u⋅ln(9), where ln(9) is the natural logarithm of 9.
Differentiate inner function: Differentiate the inner function with respect to x. The derivative of u=−x2 with respect to x is −2x.
Apply chain rule: Apply the chain rule by multiplying the derivatives from steps 3 and 4.The derivative of y with respect to x is (9−x2⋅ln(9))⋅(−2x).
Simplify expression: Simplify the expression.y′=−2x⋅9−x2⋅ln(9).
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