adam124
multiply (2+5i)(5-2i)
Delete
Share
This Question is Closed
neel2210
Best Response
You've already chosen the best response.
0
21i
AgarshnaMurari
Best Response
You've already chosen the best response.
1
The answer is 20+21i.
AgarshnaMurari
Best Response
You've already chosen the best response.
1
Rate if u like:)
anonymous
Best Response
You've already chosen the best response.
0
\[(a+bi)(c+di)=(ac-bd)+(ad+bc)i\]
anonymous
Best Response
You've already chosen the best response.
0
\[2 \times 5 - 5 \times (-2)=20\]
\[2 times (-2)+5 \times 5=21\]
anonymous
Best Response
You've already chosen the best response.
0
so answer is 20 + 20i as agarshna said.
neel2210
Best Response
You've already chosen the best response.
0
sorry
calculation mistake
its 20+21i
radar
Best Response
You've already chosen the best response.
0
Multiply through getting 10 +25i-4i-10i^2
Consolidate similar terms: 10+21i-10i^2
Take care of the last term as i^2 us equal to a -1 so the last term is 10
final answer is 21i+20
radar
Best Response
You've already chosen the best response.
0
or placing the real term first: 20+21i
radar
Best Response
You've already chosen the best response.
0
Any questions regarding the procedure for obtaining the solution?