Q. For the following equation, find f′(x).f(x)=−7x5+7x3−9x2−9x−8Answer: f′(x)=
Apply Power Rule: To find the derivative of the function f(x)=−7x5+7x3−9x2−9x−8, we will apply the power rule to each term separately. The power rule states that the derivative of xn with respect to x is n⋅x(n−1).
Derivative of −7x5: First, we find the derivative of the term −7x5. Using the power rule, we get:dxd(−7x5)=−7×5×x5−1=−35x4.
Derivative of 7x3: Next, we find the derivative of the term 7x3. Using the power rule, we get:dxd(7x3)=7⋅3⋅x3−1=21x2.
Derivative of −9x2: Then, we find the derivative of the term −9x2. Using the power rule, we get:dxd(−9x2)=−9×2×x2−1=−18x.
Derivative of −9x: After that, we find the derivative of the term −9x. Since this is a linear term, its derivative is simply the coefficient: dxd(−9x)=−9.
Derivative of Constant Term: Lastly, the derivative of a constant term like −8 is 0, since constants do not change and therefore their rate of change is zero:rac{d}{dx}(-8) = 0.
Combine Derivatives: Now, we combine all the derivatives we found to get the derivative of the entire function f(x):f′(x)=−35x4+21x2−18x−9.
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