x²-6x-7=0
D=36-(-7)*4=36+28=64
x1=(6+√64)/2= (6+8)/2=7
x2=(6-√64)/2=(6-8)/2=-1
x²+12x+32=0
D=12²-4*32=144-128=16
x1=(-12+√16)/2=(-12+4)/2=-4
x2=(-12-√16)/2=(-12-4)/2=-8
x²-6x-7=0
D=36-(-7)*4=36+28=64
x1=(6+√64)/2= (6+8)/2=7
x2=(6-√64)/2=(6-8)/2=-1
x²+12x+32=0
D=12²-4*32=144-128=16
x1=(-12+√16)/2=(-12+4)/2=-4
x2=(-12-√16)/2=(-12-4)/2=-8