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m in (-oo:+oo)
2*m^2-((5/2)*m^2)+3*m+11*m+15 = 0
2*m^2+(-5/2)*m^2+3*m+11*m+15 = 0
14*m-1/2*m^2+15 = 0
DELTA = 14^2-(-1/2*4*15)
DELTA = 226
DELTA > 0
m = (226^(1/2)-14)/(-1/2*2) or m = (-226^(1/2)-14)/(-1/2*2)
m = 14-226^(1/2) or m = 226^(1/2)+14
m in { 14-226^(1/2), 226^(1/2)+14 }
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