Question

phan tich thanh nhan tu 

( 3x+1 )^2-(x+1 )^2

 

Answer 1

\(\left(3x+1\right)^2-\left(x+1\right)^2\)

\(=\left(3x+1+x+1\right)\left(3x+1-x-1\right)=2x\left(4x+2\right)=4x\left(2x+1\right)\)

Answer 2

(3x+1)²-(x+1)²

=[(3x+1)-(x+1)][(3x+1)+(x+1)]

=[3x+1-x-1][3x+1+x+1]

=[2x][4x+2]

=2x*[2(2x+1)]

=4x(2x+1)

Answer 3

thanks