Fidn the solutions to the quadratic equation: x^2 - 16 = 0
Solve by adding 16 to both sides of the equation yielding: x^2 = 16. Then take the square root of both sides (remembering that taking the square root gives us a positive and a negative answer), giving us x = +/- sqrt(16) = +/- 4. So the solution are x=+4 and x=-4.
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