\(=3x^2+xy+5x+\left(21xy+7y^2+35y\right)+\left(6x+2y+10\right)\)
\(=x\left(3x+y+5\right)+7y\left(3x+y+5\right)+2\left(3x+y+5\right)\)
\(=\left(x+7y+2\right)\left(3x+y+5\right)\)
3x2+22xy+11x+37y+7y\(^2\)+10
=3x\(^2\) +xy+21xy+5x+6x+35y+2y+7y\(^2\)+10
= 3x(x+7y+2) + y(x+2+7y) + 5(x+7y+2)
= (x+7y+2).(3x+y+5)