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b)
delta= 1-4*(-2)*3= 1+24=25
pierwiastek z delty= 5
x1=(-1+5)/(2*-2)= 4/-4=-1
x2=(-1-5)/(2*-2)=-6/-4=1,5
b)x^2-6x-7=0
delta= 36-4*-7*1= 36+28=64
pierwiastek z delty=8
x1=(6+8)/(2*1)=14/2= 7
x2=(6-8)/(2*1)=-2/2=-1
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