f(x)= x^3 - 18x^2 (x,y)= (smaller x value) (x,y)= (larger x value)
f(x)= x^3 - 18 x^2 The tangental gradient is the derivative: f'(x)= [d/dx](x^3 - 18 x^2) The tangent is horizontal when its gradient is 0. 0 = f'(x) Find the roots. (Hint: Factorise)
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