Q. Find the derivative of the following function.y=2−8x5+2x4Answer: y′=
Identify Function Components: Identify the function and its components.We have the function y=2−8x5+2x4. This is an exponential function with a base of 2 and an exponent that is a polynomial in x.
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 2u and the inner function is u=−8x5+2x4.
Differentiate Outer Function: Differentiate the outer function with respect to the inner function u. The derivative of 2u with respect to u is (2u)⋅ln(2), where ln(2) is the natural logarithm of 2.
Differentiate Inner Function: Differentiate the inner function u=−8x5+2x4 with respect to x. The derivative of −8x5 is −40x4, and the derivative of 2x4 is 8x3. So, the derivative of the inner function u with respect to x is u′=−40x4+8x3.
Apply Chain Rule Multiplication: Apply the chain rule by multiplying the derivatives from Step 3 and Step 4.The derivative of y with respect to x is y′=(2−8x5+2x4)⋅ln(2)⋅(−40x4+8x3).
Simplify Derivative Expression: Simplify the expression for the derivative.y′=(2−8x5+2x4)⋅ln(2)⋅(−40x4+8x3) can be left as is, or factored to show the common factor of 8x3.y′=8x3⋅(2−8x5+2x4)⋅ln(2)⋅(−5x+1)
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