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x in (-oo:+oo)
x-((2/2)*x^2)-(9*x)+10 = 0
x-x^2-9*x+10 = 0
10-x^2-8*x = 0
DELTA = (-8)^2-(-1*4*10)
DELTA = 104
DELTA > 0
x = (104^(1/2)+8)/(-1*2) or x = (8-104^(1/2))/(-1*2)
x = (2*26^(1/2)+8)/(-2) or x = (8-2*26^(1/2))/(-2)
x in { (2*26^(1/2)+8)/(-2), (8-2*26^(1/2))/(-2) }
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