How do you find out the square root by repeated subtraction? - Answers

1. Pick the next number up that has a perfect square root, and take the square root of that. e.g if you want the square root of 17, pick 25, and take the square root to get 5. 2. Take the number from part 1) and subtract the square of that number minus the original number you wanted the square root of, divided by two times the number from part 1). e.g. if the number you originally wanted the square root of is A, and the thing you found in part 1) is F, evaluate this formula: F - (F2-A)/(2F). 3. Repeat over and over again, but use the number you found in part 2) instead of the one you found in part 1). 4. Repeat again and again until tired.