Question

find the complex conjugate of (2+5i)^2

Answer 1

Answer:

$(2+5i)^2 \\ = 4 + 25i {}^{2} + 20i \\ = 4 - 25 + 20i \\= - 21 + 20i \\ conjugte \: of - 21 + 20i = - 21 - 20i$