Expanding each expression:
(x+2)^2 = x^2 + 4x + 4
(3x-y)^2 = 9x^2 - 6xy + y^2
(5a+b)^2 = 25a^2 + 10ab + b^2
(a^2+b^2)^2 = a^4 + 2a^2b^2 + b^4
Expanding each expression:
(x+2)^2 = x^2 + 4x + 4
(3x-y)^2 = 9x^2 - 6xy + y^2
(5a+b)^2 = 25a^2 + 10ab + b^2
(a^2+b^2)^2 = a^4 + 2a^2b^2 + b^4