Q. Find the derivative of the following function.y=3x2−4xAnswer: y′=
Identify function components: Identify the function and its components.The function y=3(x2−4x) is an exponential function with base 3 and exponent x2−4x.
Apply chain rule for derivatives: Apply the chain rule for derivatives. 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 3u and the inner function is u(x)=x2−4x.
Find derivative of outer function: Find the derivative of the outer function with respect to u. The derivative of 3u with respect to u is 3u⋅ln(3), where ln(3) is the natural logarithm of 3.
Find derivative of inner function: Find the derivative of the inner function with respect to x. The derivative of u(x)=x2−4x with respect to x is dxd(x2)−dxd(4x), which simplifies to 2x−4.
Apply chain rule: Apply the chain rule.Using the chain rule, the derivative of y with respect to x is the derivative of the outer function evaluated at the inner function times the derivative of the inner function. This gives us y′=(3x2−4x⋅ln(3))⋅(2x−4).
Simplify expression: Simplify the expression.We can simplify the expression for the derivative to y′=3(x2−4x)⋅ln(3)⋅(2x−4).
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