`#Mon`
`37)3x^2-22xy-4x+8y+7y^2+1`
`=3x^2-21xy-xy-3x-x+7y+y+7y^2+1`
`=(3x^2-21xy-3x)-(xy-7y^2-y)-(x-7y-1)`
`=3x(x-7y-1)-y(x-7y-1)-(x-7y-1)`
`=(x-7y-1)(3x-y-1)`
`38)2x^2+5x-12y^2+12y-3-10xy`
`=(2x^2-6xy-6x)-(4xy-12xy^2-12y)+(x-3y-3)`
`=2x(x-3y-3)-4y(x-3y-3)+(x-3y-3)`
`=(x-3y-3)(2x-4y+1)`