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http://prntscr.com/miymhe

 Feb 9, 2019
 #1
avatar+846 
+1

(1+2i)(1+2i)

expand it you have

1+2i+2i+4i^2 

i^2 is equal to -1

so 1+2i+2i+4(-1)

which gives u

1-4+4i

which is 

A: -3+4i

 Feb 9, 2019
 #2
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ohh thnxx

 Feb 9, 2019

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