3 years ago

What is (5+2i)*(5+2i)?

Mathematics

2 answers:

Strike441 [17]3 years ago

8 0

25+10i+10i+4i^2
25-4
21+20i
20i+21

OLga [1]3 years ago

7 0

<span> (5+2i) * (5+2i)

Distribute...

25 + 10 i + 10 i + 4i^2

Remember ... when there is a number with i^2 it will equal to (-1)...

So that means in this question .. I replace 4i^2 with - 4 because 4 ( -1) = -4

Now I can combine like terms....

25 + 10i + 10i - 4

Soo... The answer is 21 + 20i</span>

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