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Mathematics 8 Online
OpenStudy (anonymous):

What is the quotient of the expression given in standard form?

OpenStudy (anonymous):

\[\frac{ 1+2\sqrt{3i} }{ 1+\sqrt{3i} }\]

OpenStudy (solomonzelman):

rationalize by multiplying times the denominator's conjugate.

OpenStudy (solomonzelman):

what is the conjugate for \(1+\sqrt{3i}\) ?

OpenStudy (anonymous):

1-sqrt(3u)

OpenStudy (anonymous):

(3i)

OpenStudy (solomonzelman):

that u was supposed to by "i" correct?

OpenStudy (solomonzelman):

yes

OpenStudy (solomonzelman):

Yes, that is the correct conjugate

OpenStudy (anonymous):

yea

OpenStudy (solomonzelman):

ok, now multiply

OpenStudy (solomonzelman):

wait, is it \(\large\color{black}{ \displaystyle \frac{1+2\sqrt{3i}}{1-\sqrt{3i}} }\) or is it \(\large\color{black}{ \displaystyle \frac{1+2i\sqrt{3}}{1-i\sqrt{3}} }\)

OpenStudy (anonymous):

\[\frac{ 7 }{ 4 }-\frac{ \sqrt{3} }{ 4}i\]

OpenStudy (solomonzelman):

you did this for the first or the second expression that I offered?

OpenStudy (anonymous):

I think this was the first one

OpenStudy (solomonzelman):

in the first one it is not an i, it is the 4th root of -1 , not a second.

OpenStudy (anonymous):

\[\frac{ 7 }{ 4 }+\frac{ \sqrt{3} }{ 4 }i\]

OpenStudy (anonymous):

I promise I will fall asleep if I stop now

OpenStudy (solomonzelman):

\(\large\color{black}{ \displaystyle \frac{1+2\sqrt{3i}}{1+\sqrt{3i}} }\) (yeah, a +, not a - ) \(\large\color{black}{ \displaystyle \frac{(1+2\sqrt{3i})(1-\sqrt{3i})}{(1+\sqrt{3i})(1-\sqrt{3i})} }\) \(\large\color{black}{ \displaystyle \frac{1+\sqrt{3i}-6i}{1-3i} }\) \(\large\color{black}{ \displaystyle \frac{(1+\sqrt{3i}-6i)(1+3i)}{(1-3i)(1+3i)} }\) I will post till this point now

OpenStudy (solomonzelman):

\(\large\color{black}{ \displaystyle \frac{1+\sqrt{3i}-6i+3i+3i\sqrt{3i}+18}{1+3} }\)

OpenStudy (anonymous):

did I post the answer?

OpenStudy (solomonzelman):

\(\large\color{black}{ \displaystyle \frac{19+(1+3i)\sqrt{3i}-3i}{4} }\)

OpenStudy (solomonzelman):

I didn't even get the question

OpenStudy (solomonzelman):

this is the first expression, and it doesn't really have a simple \(a+bi\) form

OpenStudy (anonymous):

\[\frac{ 7 }{ 4 }+\frac{ \sqrt{3} }{ 4 }i \]

OpenStudy (solomonzelman):

what problem were you doing, were you doing \(\large\color{black}{ \displaystyle \frac{1+2\sqrt{3i}}{1+\sqrt{3i}} }\) ?

OpenStudy (solomonzelman):

then, it is incorrect, b/c there is not standard form for this expression.

OpenStudy (solomonzelman):

On the other hand, if it is \(\large\color{black}{ \displaystyle \frac{1+2i\sqrt{3}}{1+i\sqrt{3}} }\) ....

OpenStudy (solomonzelman):

\(\large\color{black}{ \displaystyle \frac{(1+2i\sqrt{3})(1-i\sqrt{3})}{(1+i\sqrt{3})(1-i\sqrt{3})} }\) \(\large\color{black}{ \displaystyle \frac{1+i\sqrt{3}-2(-1)(3)}{1-(-1)(3)} }\) \(\large\color{black}{ \displaystyle \frac{1+i\sqrt{3}+6}{1+3} }\) \(\large\color{black}{ \displaystyle \frac{7+i\sqrt{3}}{4} }\)

OpenStudy (solomonzelman):

then you are correct....

OpenStudy (anonymous):

:)

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