D = b^2 - 4ac = 7^2 - 4(1 + 12) = 49 - 48 = 1
x1 = -D^(1/2) -b / 2a = -1 - 7/2 = -4
x2 = +D^(1/2) -b / 2a = 1 - 7/2 = -3
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D = b^2 - 4ac = 7^2 - 4(1 + 12) = 49 - 48 = 1
x1 = -D^(1/2) -b / 2a = -1 - 7/2 = -4
x2 = +D^(1/2) -b / 2a = 1 - 7/2 = -3