Do the addition, get the answer and then find its square root!
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17.066 You can type square root of 291.25 into the Google search bar for answers like this.
There are two because the square root of 16 for example is 4 or -4
The answers are ± 625
Do you mean: What is the square root of (8 squared)? If so, there are two answers: 8 and -8. Or do you mean: What is the (square root of 8) squared? If so, there is only one answer: 8.
Definition of Square Root: The Square Root of a number 'X' is equal to 'A' when X=A*A By definition, the square root of a positive number has two answers, one negative and one positive, that have equal magnitudes. i.e. The square roots of 4 are 2 and -2. The Non-Negative Square Root is simply asking for the positive root.