1. x² - х - 6 = 0
2. 2х² - 4х - 30 = 0
3. х² + 15х - 100 = 0

1. d=1*1+4*6=1+24=25√25=5x1=(1+5/2)=6/2=3x2=(1-5/2)=-4/2=-22.d=4*4+4*2*30=16+240=256√256=16x1=(4+16/4)=20/4=5x2=(4-16/4)=-12/4=-33.d=15*15+4*100=225+400=625√625=25x1=(-15+25/2)=10/2=5x2=(-15-25/2)=-40/2=-20

1.D=b^2-4acD=1-4•1•(-6)=25, √D=5x1=-b+√D/2a= 1+5/2= 3x2=-b-√D/2a=1-5/2= -22.D=b^2-4acD=16-4•2•(-30)=256, √D=16x1=-b+√D/2a=4+16/4=5x2=-b-√D/2a=4-16/4=-33. .D=b^2-4acD=225-4•1•(-100)=625, √D=25x1=-b+√D/2a= -15+25/2=5x2=-b-√D/2a=-15-25/2=-20