x2 + 4x -12 = 0
a=1 b=4 C=-12
x= -4 +- /42 -4(1)(-12)
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2(1)
x= -4 +- / 16 + 48
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2
x= -4 +- / 64
__________
2
x= -4 + 8 = 4 = 2
______ _
2 2
x= -4-8 = -12 = -6
____ ___
2 2
x2 + 12 - 4 = 0
