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x in (-oo:+oo)
(1/2)*x^2+5*x-252 = 0
1/2*x^2+5*x-252 = 0
DELTA = 5^2-(-252*1/2*4)
DELTA = 529
DELTA > 0
x = (529^(1/2)-5)/(1/2*2) or x = (-529^(1/2)-5)/(1/2*2)
x = 18 or x = -28
x in { -28, 18 }
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