x = +1 or -1
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x2 + 2x -6 = 0 x2 + 2x + 1 = 7 (x + 1)2 = 7 x = -1 ± √7
G of x= x2+1the G(0)= (0)2+10+1G(0)= 1
x2 23x equals 0
y = x2 + x = 0 x (X + 1) = 0 x = 0 is one solution x = -1 is the other
x2 + 4x + 3 = 0 (x + 1)(x + 3) = 0 x ∈ {-3, -1}