I will do one...third one.
(-y^2 +2) (y^2-3)
using the FOIL method
(-y^2*y^2 +2*(-3) +2y^2-6)
-y^4+2y^2 -6 + 2y^2 -6 and combine the negative sixes, and they y^2 terms.
multiply
x (x+y+2)
(-6 -x) (6+x)
(-y^2 +2) (y^2-3)
2 answers
x^2 + xy +2x
-36-12x-x^2 or -(x^2 + 12x +36)
-y^4 + 5y^2 -6 or-(y^4 - 5y^2 + 6)
-36-12x-x^2 or -(x^2 + 12x +36)
-y^4 + 5y^2 -6 or-(y^4 - 5y^2 + 6)