Q. Given the function f(x)=−3(4x2−7x)5, find f′(x) in any form.Answer: f′(x)=
Identify Functions: To find the derivative of the function f(x)=−3(4x2−7x)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.
Find Outer Function Derivative: First, let's identify the outer function and the inner function. The outer function is u5, where u is the inner function. The inner function is 4x2−7x.
Find Inner Function Derivative: Now, we will find the derivative of the outer function with respect to the inner function u. The derivative of u5 with respect to u is 5u4.
Apply Chain Rule: Next, we will find the derivative of the inner function 4x2−7x with respect to x. The derivative of 4x2 is 8x, and the derivative of −7x is −7. So, the derivative of the inner function is 8x−7.
Simplify Expression: Now, we apply the chain rule. We multiply the derivative of the outer function by the derivative of the inner function. This gives us: f′(x)=−3×5(4x2−7x)4×(8x−7).
Final Answer: Simplify the expression by multiplying the constants and keeping the rest of the expression in its current form. f′(x)=−15×(4x2−7x)4×(8x−7).
Final Answer: Simplify the expression by multiplying the constants and keeping the rest of the expression in its current form. f′(x)=−15×(4x2−7x)4×(8x−7).The final answer is f′(x)=−15(4x2−7x)4(8x−7).
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