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delta=1+24=25
x1=-1-5/2=-3 x2=-1+5/2=2
x^2+x+5=nie można rozłożyć
delta=1-20=-19 brak pierwiastków
b) -4x^2-8x+5=-4(x-1/2)(x+5/2)
delta=64+80=144
x1=8-12/-8=1/2 x2=8+12/-8=20/-8=-5/2
x^2-2x-15=(x+3)(x-5)
delta=4+60=64
x1=2-8/2=-3 x2=2+8/2=5