Rewrite function: To find the derivative of the function h(x)=x5, we first need to rewrite the function in a form that makes it easier to differentiate. The square root of x5 can be written as (x5)21.
Apply chain rule: Now we apply the chain rule to differentiate the function. 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 u(1/2) and the inner function is x5.
Differentiate outer function: Differentiating the outer function u(1/2) with respect to u gives (1/2)u(−1/2). Then we differentiate the inner function x5 with respect to x, which gives us 5x4.
Combine derivatives: Now we combine the derivatives of the outer and inner functions. The derivative of h(x) is (21)(x5)−21×5x4.
Simplify expression: Simplify the expression by combining like terms. This gives us (25)x(4−21), which simplifies to (25)x(27).
Evaluate at x=4: Now we evaluate the derivative at x=4. We substitute x with 4 in the expression 25x27 to get 25(4)27.
Calculate value: Calculate the value of (4)27. Since (4)27 is the same as 47, and 47 is 16384, we take the square root of 16384, which is 128.
Multiply to get final answer: Now multiply (25) by 128 to get the final answer. (25)×128=5×64=320.
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