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4*x-((1/2)*x^2)-3 = 0
(-1/2)*x^2+4*x-3 = 0
4*x-1/2*x^2-3 = 0
DELTA = 4^2-(-3*(-1/2)*4)
DELTA = 10
DELTA > 0
x = (10^(1/2)-4)/(-1/2*2) or x = (-10^(1/2)-4)/(-1/2*2)
x = 4-10^(1/2) or x = 10^(1/2)+4
x in { 4-10^(1/2), 10^(1/2)+4 }
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