The expressions are given below:
What is complex number?
Complex numbers are numbers that consist of two parts — a real number and an imaginary number.
Given:
45+ 2i
9+4 i + 2( 4 + 7i)(1- 2i)
= 9 +4i + 2( 4 - 8i + 7i +14)
=9 + 4i + 36 - 2i
= 45 - 2i
and,
(9 + 4i )+ (36 - 2i)
=45 + 2i
Hence, learn more about complex number here:
https://brainly.com/question/28007020
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