Answer:
x²-8x-9=0
x²-9x+x-9=0
x(x-9)+1(x-9)=0
(x-9)(x+1)=0
x=9 or x=-1
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Answer:
x²-8x-9=0
x²-9x+x-9=0
x(x-9)+1(x-9)=0
(x-9)(x+1)=0
x=9 or x=-1