Q. Find the derivative of the following function.y=8−9x5+6x4Answer: y′=
Identify Function Components: Identify the function and its components.We have y=8(−9x5+6x4). This is an exponential function with a base of 8 and an exponent of −9x5+6x4.
Apply Chain Rule: 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.Here, the outer function is a(u)=8u and the inner function is u(x)=−9x5+6x4.
Derivative of Outer Function: Find the derivative of the outer function a(u) with respect to u. The derivative of au with respect to u is au⋅ln(a), where a is a constant. So, a′(u)=8u⋅ln(8).
Derivative of Inner Function: Find the derivative of the inner function u(x) with respect to x. The inner function is u(x)=−9x5+6x4. Using the power rule, the derivative is u′(x)=dxd(−9x5)+dxd(6x4)=−45x4+24x3.
Apply Chain Rule with Derivatives: Apply the chain rule using the derivatives from steps 3 and 4.The chain rule gives us y′(x)=a′(u(x))⋅u′(x).Substitute a′(u) and u′(x) into the equation.y′(x)=(8−9x5+6x4⋅ln(8))⋅(−45x4+24x3).
Simplify Derivative: Simplify the expression for the derivative.y′(x)=8(−9x5+6x4)⋅ln(8)⋅(−45x4+24x3).This is the simplified form of the derivative.
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