Q. Find the derivative of the following function.y=3−5x2Answer: y′=
Identify Functions: We are given the function y=3−5x2. To find the derivative, we will use 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.
Derivative of Outer Function: First, let's identify the outer function and the inner function. The outer function is f(u)=3u, and the inner function is u(x)=−5x2. We will need to take the derivative of both of these functions.
Derivative of Inner Function: The derivative of the outer function f(u)=3u with respect to u is f′(u)=3u⋅ln(3), using the fact that the derivative of ax with respect to x is ax⋅ln(a).
Apply Chain Rule: The derivative of the inner function u(x)=−5x2 with respect to x is u′(x)=dxd(−5x2)=−10x.
Substitute Derivatives: Now we apply the chain rule. The derivative of y with respect to x is y′=f′(u)⋅u′(x). Substituting the derivatives we found, we get y′=(3−5x2⋅ln(3))⋅(−10x).
Simplify Final Derivative: Simplify the expression to get the final derivative. y′=−10x⋅ln(3)⋅3−5x2.
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