1. Let f(x) = x. a) Write down f'(x). (1) Point P (2, 16) lies of...

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1. Let f(x) = x. a) Write down f'(x). (1) Point P (2, 16) lies of the graph of f(x). b) Find the gradient of the tangent to the graph of y = f(x) at P. (2) c) Find the equation of the normal to the graph at P. Give your answer in the form ax + by + d = 0, where a, b and d are integers. (3) 1. Let f(x) = x. a) Write down f'(x). (1) Point P (2, 16) lies of the graph of f(x). b) Find the gradient of the tangent to the graph of y = f(x) at P. (2) c) Find the equation of the normal to the graph at P. Give your answer in the form ax + by + d = 0, where a, b and d are integers. (3)