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3. (2 marks) (a) Write down the formula needed for \"Newton's method". (b) Starting with a guess of $0 = 3, use four iterations (steps) of Newton's method to nd an approximation for a positive solution to the equation :19."1 : 8. 1 Display your calculation in a nice table like this: aim I..- (c) Using a calculator, write down the decimal form of v'EL How good is Newton's method