If ab = 10 and a^2 + b^2 = 40, then find (a + b)^4.
(a+b)^2 = a^2 + b^2 + 2ab
(a+b)^2 = 40 + 20
(a+b)^2 = 60
(a+b)^2^2 = 3600
=^._.^=
