a) (x^4 - x^2)^2 = x^8 - 2x^6 + x^4b) (y^4 + y^3)^2 = y^8 + 2y^7 + y^6c) (6ab^2 - a^2b)^2 = 36a^2b^4 - 12a^3b^3 + a^4b^2d) (5a^4 - 2a^2b^4)^2 = 25a^8 - 20a^6b^4 + 4a^4b^8
a) (x^4 - x^2)^2 = x^8 - 2x^6 + x^4
b) (y^4 + y^3)^2 = y^8 + 2y^7 + y^6
c) (6ab^2 - a^2b)^2 = 36a^2b^4 - 12a^3b^3 + a^4b^2
d) (5a^4 - 2a^2b^4)^2 = 25a^8 - 20a^6b^4 + 4a^4b^8