Question

6x2y2 + 3x2y – 4xy2 + 5x2y – 2x2y2

Answer 1

First, try using ^ for powers online
6x^2y^2 + 3x^2y – 4xy^2 + 5x^2y – 2x^2y^2
Now reorder stuff to make it easier to see like terms
6x^2y^2 - 2x^2y^2 + 3x^2y + 5x^2y - 4xy^2
Now collect like terms
4x^2y^2 + 8x^2y - 4xy^2
That may be all you want -- you didn't say. But, we can proceed by factoring out 4xy
4xy(xy + 2x - y)