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X^2 + 7x + 12 =0
(x +7/2)² - 49/4 +12 = 0
(x +7/2)² = 49/4 - 12 = 49/4 -48/4 = 1/4
(x +7/2) = +√1/4
(x +7/2) = + 1/2
x1 = -7/2 +1/2 = -6/2 = -3
X2 = -7/2 -1/2 = -8/2 = -4
b)
(X+3) (X+1) =0
x² + x + 3x +3 = x² +4x +3 =0
a = 1 b = 4 c=3