Solving Equations with a Square Root

When we solve an equation by taking a square root, we have to consider both a positive and negative outcome.

For example consider -3 and 3

now 3² = 9 and -3²=9

Thus when we have an equation such that

x² = 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.