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w in (-oo:+oo)
15*w^2-(((10*w)/5)*w^2)-(35*w) = 0
15*w^2-2*w^3-35*w = 0
15*w^2-2*w^3-35*w = 0
w*(15*w-2*w^2-35) = 0
15*w-2*w^2-35 = 0
DELTA = 15^2-(-35*(-2)*4)
DELTA = -55
DELTA < 0
w = 0
w = 0
w = 0
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