\(\Leftrightarrow9x^2-9x-x+1\)
\(\Leftrightarrow9x\left(x-1\right)-\left(x-1\right)\)
\(\Leftrightarrow\left(x-1\right)\left(9x+1\right)\)
chúc bạn hok tốt!!
9x^2 - 10x + 1
= 9x^2 - 9x - x +1
= (9x^2 - 9x) - ( x - 1)
= 9x ( x-1) - (x-1)
= (x-1) (9x-1)
vậy 9x^2 - 10x + 1 = (x-1) (9x-1)