Ok, Here is another calculus problem to check. Can someone tell me if I done this one correctly.
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Originally Posted by robasc Ok, Here is another calculus problem to check. Can someone tell me if I done this one correctly. You have a product, and both factors contain $\displaystyle x.$ Isn't there a certain rule you should be using here? ...for the product? Go to it.
Originally Posted by robasc Ok, Here is another calculus problem to check. Can someone tell me if I done this one correctly. product rule and chain rule ... $\displaystyle f(x) = x(3x-9)^3$ $\displaystyle f'(x) = x \cdot 3(3x-9)^2 \cdot 3 + (3x-9)^3 \cdot 1$ $\displaystyle f'(x) = 9x(3x-9)^2 + (3x-9)^3$ $\displaystyle f'(x) = (3x-9)^2[9x + (3x-9)]$ $\displaystyle f'(x) = (3x-9)^2(12x-9)$
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