Multiply and simplify:(7+4i)2
Write the answer in the form a + bi, where a and b are real numbers
(7 + 4i)^2 =
(7 + 4i) (7 + 4i) =
49 + 28i + 28i + 16i^2 =
49 + 56i + 16(-1) =
49 + 56i - 16 =
33 + 56i
+16 
