Answer
21-20i
Work Step by Step
$(5-2i)^{2}$=(5-2i)(5-2i)
25-10i-10i+4$i^{2}$ Double Distribution (FOIL)
25-20i+4(-1) Combine like terms and use the property $i^{2}$=-1
25-20i-4 Simplify
21-20i Simplify
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