x²-2x-8=0
D= 4+32= 36
x1= (2+6)/2= 4
x2= (2-6)/2= -2
x²+7x-18=0
D= 49+72= 121
x1= (-7+11)/2= 2
x2= (-7-11)/2= -9
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x²-2x-8=0
D= 4+32= 36
x1= (2+6)/2= 4
x2= (2-6)/2= -2
x²+7x-18=0
D= 49+72= 121
x1= (-7+11)/2= 2
x2= (-7-11)/2= -9