Let ƒ (x) E R[x]. Suppose that f(a) = 0 and f'(a) = 0, where f'(x) is the derivative o f(x). Show that (x – a)² divides f(x).

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Q: Let z=6. Differentiate the function f(x) = 7x7 - 8x + z. The required derivative is f '(x) =

A: Please find attachment