SOLUTION: how do i know if i get the right answer? a lot of times on tests, i don't know if i have the right answer or not, usually on the more difficult questions. here's one question: (

Question 222848: how do i know if i get the right answer? a lot of times on tests, i don't know if i have the right answer or not, usually on the more difficult questions.
here's one question: (2+3i)+(-4+5i)-(9-3i)/3.
the slash is dividing. the answer is -5-9i i beleive. what i wanna know, is how do you expand this question? how is it solved?
thanks.
Found 2 solutions by jim_thompson5910, stanbon:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
If the expression is , then...

Start with the given expression.

Break up the fraction

Reduce.

Distribute

Combine like terms.

So
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
(2+3i)+(-4+5i)-(9-3i)/3
------------------
Assuming that "3" is only dividing (9-3i) you get:
-----------------------
= (2+3i)+(-4+5i)-(3-i)
---
= [2-4-3]+[3i+5i+i]
---
= -5 + 9i
=================
Cheers,
Stan H.
----------------
When you have equations you can check you answer to see if it works.
---
When you have a problem like the one you posted you can only
check your own work to see that you did not make a mistake.
===============================================================
Cheers,
Stan H.

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