x^2+4x+1=0
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x = (1/2)*(-4 +- sqrt(16 - 4))
= (1/2)*(-4 +- sqrt(12))
= (1/2)*(-4 +- sqrt(4*3))
= (1/2)*(-4 +- 2*sqrt(3))
= (-2 +- sqrt(3)) <<<
b) is the answer
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x = (1/2)*(-4 +- sqrt(16 - 4))
= (1/2)*(-4 +- sqrt(12))
= (1/2)*(-4 +- sqrt(4*3))
= (1/2)*(-4 +- 2*sqrt(3))
= (-2 +- sqrt(3)) <<<
b) is the answer