What do we mean by solving an equation Example 1.Solve the equation z2 -1. x2=1 x2-1=0 (x-1)(x+1) =0 x=10r=-1 Need to check that in fact (1)2=1 and (-1)2=1. Exercise.Solve the equation Vx+Vx-a=2 where a is a positive real number.What do we mean by solving an equation ? Example 1. Solve the equation x 2 = 1. x 2 = 1 x 2 − 1 = 0 (x − 1)(x + 1) = 0 x = 1 or = −1 • Need to check that in fact (1)2 = 1 and (−1)2 = 1. Exercise. Solve the equation √ x + √ x − a = 2 where a is a positive real number