Express the following into sum of two squares:
(a) 256 (b) 281 (c) 512 (d) 2048
(a) $256 = 16^2 + 0^2$
(b) $281=16^2 + 5^2$
(c) $512 = 16^2 + 16^2$
(d) $2048 = 32^2 + 32^2$