x2 - 5x + 6
= x2 - 2x - 3x + 6
= ( x2 - 2x ) - ( 3x - 6 )
= x( x - 2 ) - 3( x - 2 )
= ( x - 3 )( x - 2 )
Tìm x biết:
(x+1)^2 + 2x (x-2) = 3 (x+4) (x+1)
\(x^2-5x+6\)
\(=x^2+x-6x+6\)
\(=x.\left(x-1\right)-6.\left(x-1\right)\)
\(=\left(x-6\right).\left(x-1\right)\)