Q. Find the derivative of the following function.y=3−8x2Answer: y′=
Identify Function Components: Identify the function and its components.We have y=3−8x2. This is an exponential function where the base is a constant (3) and the exponent is a function of x (−8x2).
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 f(u)=3u and the inner function is u(x)=−8x2.
Differentiate Outer Function: Differentiate the outer function with respect to u. The derivative of f(u)=3u with respect to u is f′(u)=3u⋅ln(3), where ln(3) is the natural logarithm of 3.
Differentiate Inner Function: Differentiate the inner function with respect to x. The derivative of u(x)=−8x2 with respect to x is u′(x)=dxd(−8x2)=−16x.
Apply Chain Rule with Derivatives: Apply the chain rule using the derivatives from steps 3 and 4.y′=f′(u(x))⋅u′(x)=(3−8x2⋅ln(3))⋅(−16x).
Simplify Derivative: Simplify the expression for the derivative.y′=−16x⋅3−8x2⋅ln(3).This is the derivative of the function y with respect to x.
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