Identify Functions: To find the derivative of the function k(x)=e(−x(1/2)+x(−3/5)), we will use the chain rule. 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.
Derivative of Outer Function: First, let's identify the outer function and the inner function. The outer function is eu, where u is the inner function. The inner function is u(x)=−x1/2+x−3/5.
Derivative of Inner Function: The derivative of the outer function eu with respect to u is eu. So, (dud)(eu)=eu.
Derivative of −x21: Now, we need to find the derivative of the inner function u(x)=−x21+x−53. We will differentiate each term separately using the power rule, which states that dxd(xn)=nxn−1.
Derivative of x−53: The derivative of −x21 with respect to x is (−21)x21−1=(−21)x−21.
Combine Derivatives: The derivative of x(−3/5) with respect to x is (−3/5)x(−3/5−1)=(−3/5)x(−8/5).
Apply Chain Rule: Combining the derivatives of both terms, we get the derivative of the inner function u′(x)=(−21)x−21−(53)x−58.
Substitute into Expression: Now, we apply the chain rule. The derivative of k(x) with respect to x is the derivative of the outer function evaluated at the inner function times the derivative of the inner function. So, k′(x)=eu⋅u′(x).
Simplify if Possible: Substitute u(x) and u′(x) into the expression for k′(x). We get k′(x)=e(−x21+x−53)⋅((−21)x−21−(53)x−58).
Final Answer: Simplify the expression for k′(x) if possible. However, in this case, the expression is already in its simplest form. So, the final answer is k′(x)=e(−x(1/2)+x(−3/5))×((−1/2)x(−1/2)−(3/5)x(−8/5)).
More problems from Find derivatives of using multiple formulae