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Newton's Iteration Formula

The fault probably lies with me, but for some strange reason I keep getting the answer (for X3) 1.1666... rather than 1.4166...
I've just tried it again - 1.166666667. Why is the '4' not appearing? For the previous iteration (X2) I came up with the correct value that you have there (i.e. 1.5), so...

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