Find the final amount for a $750 investment at 5.25% interest compound semiannually for 25 years
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The 'i' should go in front of the square root, not inside it.
So the answer should be
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The way they wrote the expression is bit misleading as it might imply that the 'i' is under the square root. However the square root ends after the "5". It might be better to say
so there is clearer separation. But sticking the "i" in front is also a valid option.
side note: the plus minus part is already handled so there's no need to worry about that.