Question 173284
(5-2i)^2

Use Foil:
(5-2i)(5-2i)
F: 25
O: 5*-2i = -10i
I: 5*-2i = -10i
L: -2i*-2i = -4
--------------------
Combine to get:
21 - 20i
================
Cheers,
Stan H.