\(2x^3-x^2+5x+3\)
\(=2x^3-2x^2+6x+x^2-x+3\)
\(=2x\left(x^2-x+3\right)+\left(x^2-x+3\right)\)
\(=\left(2x+1\right)\left(x^2-x+3\right)\)
2x3 - x2 + 5x + 3
= 2x3 + x2 - 2x2 - x + 6x + 3
= x2 ( 2x + 1 ) - x ( 2x + 1 ) + 3( 2x + 1 )
= ( x2 - x + 3 ) ( 2x + 1 )