Question 568327
number 1 is false.
(x+y)^-2 = 1 / (x+y)^2 = 1 / (x^2 + 2xy + y^2)


number 2 is false. *****
(a^3) * (a^5) = a^(3 + 5) = a^8


number 3 is false.
(b^2)^4 = b^(2 * 4) = b^8


number 4 is false.
(xy)^3 = x^3 * y^3


number 5 is false. *****
(a^2 * b^5)^3 = a^6 * b^15