Only one of these two replaced equations is true for any valid solution. This indicates that the equation has two solutions, each of which may be obtained by replacing this equation by one of the two equations x = +3 or x = −3. įor example, given the equation x 2 = 9, one may give the solution as x = ☓. In mathematical formulas, the ± symbol may be used to indicate a symbol that may be replaced by either the plus and minus signs, + or −, allowing the formula to represent two values or two equations.
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