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x2 + 4x - 3 = 0
The quadratic formula is x = {-4 ± sqrt[(-4)2 - 4*1*(-3)]}/2
= {-4 ± sqrt[16 + 12]}/2
= {-4 ± sqrt[28]}/2
= {-4 ± 2*sqrt[7]}/2
= -2 ± sqrt[7]
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