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`26)x^3y+5x^2y`

`=x^2y*x+5*x^2y`

`=x^2y(x+5)`

`27)xy^2-25x`

`=x(y^2-25)`

`=x(y^2-5^2)`

`=x(y-5)(y+5)`

`28)7x^2+14xy`

`=7x*x+7x*2y`

`=7x(x+2y)`

`29)4x^2y-6xy^2`

`=2xy*2x-2xy*3y`

`=2xy(2x-3y)`

`30)3xy-9x^2`

`=3x*y-3x*3x`

`=3x(y-3x)`

`31)6x^2-3xy`

`=3x*2x-3x*y`

`=3x(2x-y)`

`32)3xy^2-3x^3`

`=3x*y^2-3x*x^2`

`=3x(y^2-x^2)`

`=3x(y-x)(y+x)`

`33)3xy+6xz`

`=3x*y+3x*2z`

`=3x(y+2z)`

`34)18x^2y-12x^3`

`=6x^2*3y-6x^2*2x`

`=6x^2(3y-2x)`

`35)8xy^2-2x^2y`

`=2xy*4y-2xy*x`

`=2xy(4y-x)`

`36)3xy^2+6xyz`

`=3xy*y+3xy*2z`

`=3xy(y+2z)`