Product Rule Application: To find the derivative of the function k(x)=ex(−x53−x−45), we will use the product rule. The product rule states that the derivative of a product of two functions is the derivative of the first function times the second function plus the first function times the derivative of the second function.
Identifying Functions: First, let's identify the two functions that we are dealing with. We have f(x)=ex and g(x)=−x53−x−45. We will need to find f′(x) and g′(x).
Derivative of f(x): The derivative of f(x)=ex with respect to x is f′(x)=ex, because the derivative of ex is ex.
Derivative of g(x): Now we need to find the derivative of g(x)=−x53−x−45. We will use the power rule, which states that the derivative of xn with respect to x is n⋅xn−1.
Combining Derivatives: The derivative of −x3/5 is (−3/5)⋅x3/5−1=(−3/5)⋅x−2/5.
Using Product Rule: The derivative of −x(−5/4) is (−5/4)⋅x(−5/4−1)=(−5/4)⋅x(−9/4).
Simplifying Expression: Now we can combine the derivatives of the two terms to find g′(x): g′(x)=(−53)⋅x(−52)−(45)⋅x(−49).
Final Derivative: Using the product rule, the derivative of k(x)=f(x)g(x) is k′(x)=f′(x)g(x)+f(x)g′(x). Substituting the derivatives we found, we get: k′(x)=ex(−x53−x−45)+ex((5−3)x−52−(45)x−49).
Final Derivative: Using the product rule, the derivative of k(x)=f(x)g(x) is k′(x)=f′(x)g(x)+f(x)g′(x). Substituting the derivatives we found, we get:k′(x)=ex(−x3/5−x−5/4)+ex((−3/5)⋅x−2/5−(5/4)⋅x−9/4).We can simplify this expression by factoring out ex:k′(x)=ex(−x3/5−x−5/4−(3/5)⋅x−2/5−(5/4)⋅x−9/4).
Final Derivative: Using the product rule, the derivative of k(x)=f(x)g(x) is k′(x)=f′(x)g(x)+f(x)g′(x). Substituting the derivatives we found, we get:k′(x)=ex(−x3/5−x−5/4)+ex((−3/5)∗x−2/5−(5/4)∗x−9/4).We can simplify this expression by factoring out ex:k′(x)=ex(−x3/5−x−5/4−(3/5)∗x−2/5−(5/4)∗x−9/4).This is the final derivative of the function k(x). We have successfully applied the product rule and the power rule to find the derivative.
More problems from Find derivatives of using multiple formulae