Q. Given the function f(x)=−5(5x2+9x)6, find f′(x) in any form.Answer: f′(x)=
Identify Functions: To find the derivative of the function f(x)=−5(5x2+9x)6, 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 u6 where u is the inner function, and the inner function is 5x2+9x.
Find Inner Function Derivative: Now, we will find the derivative of the outer function with respect to the inner function u. The derivative of u6 with respect to u is 6u5.
Apply Chain Rule: Next, we will find the derivative of the inner function 5x2+9x with respect to x. The derivative of 5x2 is 10x, and the derivative of 9x is 9. So, the derivative of the inner function is 10x+9.
Simplify Expression: Now, we apply the chain rule by multiplying the derivative of the outer function by the derivative of the inner function. This gives us: f′(x)=−5×6(5x2+9x)5×(10x+9).
Simplify Expression: Now, we apply the chain rule by multiplying the derivative of the outer function by the derivative of the inner function. This gives us: f′(x)=−5×6(5x2+9x)5×(10x+9). Simplify the expression by combining constants and applying the power rule. f′(x)=−30(5x2+9x)5×(10x+9).
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