\(x^2+7x+6\)
\(=x^2+x+6x+6\)
\(=x\left(x+1\right)+6\left(x+1\right)\)
\(=\left(x+1\right).\left(x+6\right)\)
\(x^2+7x+6=\left(x-6\right)\left(x-1\right)\)
-_-
Bài làm
x² + 7x + 6
<=> x² + x + 6x + 6
<=> x( x + 1 ) + 6( x + 1 )
<=> ( x + 1 )( x + 6 )
~ lớp 6 đã học đâu ~
\(x^2+7x+6\)
\(=x^2+6x+x+6\)
\(=\left(x^2+x\right)\left(6x+6\right)\)
\(=x\left(x+1\right)+6\left(x+1\right)\)
\(=\left(x+6\right).\left(x+1\right)\)