Mathematics
18 Online
OpenStudy (anonymous):
PLEASE PLEASE PLEASE HELP!!
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OpenStudy (ja1):
YESYESYESYESYESYEYSESSREWQWF
OpenStudy (anonymous):
PLEASE TELL ME WHAT IS YOUR QUESTION
OpenStudy (anonymous):
lol thank you
OpenStudy (anonymous):
Rationalize tha denominator of that.
OpenStudy (anonymous):
PLEASE c: lol
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OpenStudy (anonymous):
Answer choices:
OpenStudy (anonymous):
But if you could.. Tell me how you do it, so I can fully understand..
OpenStudy (luigi0210):
Add them, then multiply by the conjugate
OpenStudy (anonymous):
√-4 / [(7-3i) + (2+5i)]
√-4 / (7 - 3i + 2 +5i)
2i / (9 +2i)
rationalize by multiplying top and bottom by denominator's conjugate: (9 - 2i):
2i(9 -2i) / (9+2i)(9-2i)
2i(9 -2i) / [9(9) + 9(-2i) +2i(9) -4i^2]
(18i - 4i^2) / (81 -18i +18i -4i^2)
OpenStudy (anonymous):
Finish it
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OpenStudy (anonymous):
WHAT lol
OpenStudy (anonymous):
finish the problem
OpenStudy (anonymous):
answering
OpenStudy (luigi0210):
I think you might of lost her there passive :P
OpenStudy (anonymous):
yep
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OpenStudy (anonymous):
.-. ya u did lol
OpenStudy (anonymous):
Ill just guess it ... lol
OpenStudy (anonymous):
start with
\[\frac{2i}{9+2i}\] then multiply top and bottom by the conjugate of the denominator
\[\frac{2i}{9+2i}\times \frac{9-2i}{9-2i}\]
OpenStudy (anonymous):
Thanks guys :D
OpenStudy (anonymous):
(18i - 4(-1)) / (81 -4(-1))
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OpenStudy (anonymous):
the denominator is \(9^2+2^2=81+4=85\)
OpenStudy (anonymous):
the numerator is \(18i+4\)
OpenStudy (anonymous):
finish it now rae
OpenStudy (luigi0210):
You got this Rae! :D
OpenStudy (anonymous):
Here is a medal for encouraging her
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OpenStudy (luigi0210):
I'm not sure if I deserve a medal for that but thank you passive :P
OpenStudy (anonymous):
4/85 + 18i/85