Could someone me? i need to:

calculate polynomial equations through factoring.
factor: 16x +28y
factor: 21x -42xy
factor: 10x + 25x^4
factor: 32x^3y^4 - 48x^2y
factor: 36xy - 72ac
factor: 6a^2b^7-24a^2b^6
factor: m(a+2) + n(a+2)
factor: x^2 -10x
factor: x^2 + 8x
factor: x^2 + 10x + 21
factor: x^2 -4x + 4
factor: n^2 -7n + 12
factor: n^2 +5n -14
factor: n^2 -5n - 36

any is appreciated, one of them, a few, or all, ty!