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delta=b^2-4ac=9-4*2*(-2)=9+16=25
pierwiastek z delta=5
x1=(3-5)/4=-2/4=-1/2
x2=(3+5)/4=8/4=2
c)
delta=4-4*(-4)*1=4+16=20
pierw. z delta=v20=v(4*5)=2v5
x1=(4-2v5)/-8=-2(v5-2)-8=(v5-2)/4
x2=(4+2v5)/-8=-2(-v5-2)/-8=(-v5-2)/4
d)
delta=100-4*3*(-8)=100+96=196
pierw. z delta =14
x1=(10-14)/6=-4/6=-2/3
x2=(10+14)/6=24/6=4
e)
delta=9-4*(-1/4)*7=9+7=16
pierw. z delta=4
x1=(-3-4)/(-1/2)=-7*(-2)=14
x2=(-3+4)/(-1/2)=1*(-2)=-2