-x²-6x+7= -(x²+6x-7)= -(x²+7x-x-7)= -(x(x+7)-(x+7))= -(x-1)(x+7)= (1-x)(x+7)
-x²-6x+7
-(x²+6x-7)=0
D= 36+28=64
x1= (-6+8)/2= 1
x2= (-6-8)/2= -7
-(x-1)(x+7)= (1-x)(x+7)
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-x²-6x+7= -(x²+6x-7)= -(x²+7x-x-7)= -(x(x+7)-(x+7))= -(x-1)(x+7)= (1-x)(x+7)
-x²-6x+7
-(x²+6x-7)=0
D= 36+28=64
x1= (-6+8)/2= 1
x2= (-6-8)/2= -7
-(x-1)(x+7)= (1-x)(x+7)