For example consider -3 and 3

now 3

^{2}= 9 and -3

^{2}=9

Thus when we have an equation such that

x

^{2}= 9 to find x we need to take the square root of 9, however, then we have to say x= + or - 3 that is to say positive or negative 3 since it could be either and we don't know.

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