(x+1)(x+9)
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x ×( x+9) +1(x+9)
x²+9x + 1x + 9
x² + 10x + 9
use factoriesation maethod
x² +9x+x+9=0
x(x+9) +1(x+9) =0
(x+9) (x+1)=0
x= – 9. x= –1
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