40. It is easy to check that f(r) =r² – 4x has two roots. Find these two roots using %3D Newton's method In+1 = In - f(rn)/f'(In). (11) If you can find only one root, explain why? [Hint: First write the Newton's iteration formula, then use different initial values xo = 1 and then xo = -1 to see if you can get two different roots.]

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