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x in (-oo:+oo)
4*x-((11/2)*x*x)-(11*x)+15 = 0
(-11/2)*x^2+4*x-11*x+15 = 0
15-11/2*x^2-7*x = 0
DELTA = (-7)^2-(-11/2*4*15)
DELTA = 379
DELTA > 0
x = (379^(1/2)+7)/(-11/2*2) or x = (7-379^(1/2))/(-11/2*2)
x = (379^(1/2)+7)/(-11) or x = (7-379^(1/2))/(-11)
x in { (379^(1/2)+7)/(-11), (7-379^(1/2))/(-11) }
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