Question: Let f ( x ) = 8 x ^ 2 . Using the definition of derivative at a point, f ' ( a ) =

Let f(x)=8x^2. Using the definition of derivative at a point, f '(a)= lim x-->a (f(x)-f(a))/(x-a), enter the expression needed to find the derivative at x =7. f '(7)= lim x-->7

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