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Mathematics 12 Online
OpenStudy (anonymous):

Simplify

OpenStudy (anonymous):

\[\frac{ 2+\sqrt{3i} }{ 5-4i }\]

mathslover (mathslover):

rationalize it

mathslover (mathslover):

\[\large{\frac{{(2+\sqrt{3i})}(5+4i)}{(5-4i)(5+4i)}}\]

mathslover (mathslover):

can you multiply them and simplify ? @ArkGoLucky ?

OpenStudy (anonymous):

Yeah I did that but the square root 3i is still on top and I can't rid of it

OpenStudy (anonymous):

there are still 4 unlike terms on top so nothing simplifies

mathslover (mathslover):

\[\large{\frac{(10+8i+5\sqrt{3i}+4i\sqrt{3i})}{9}}\]

mathslover (mathslover):

that's enough simplification @ArkGoLucky

mathslover (mathslover):

it is in the simplified form now

OpenStudy (anonymous):

except it's 41 not 9

mathslover (mathslover):

25-(4i)^2 = 25-(16(-1)) = 25+16= 41 oops sorry :P

OpenStudy (anonymous):

but don't I need to put it into the a+bi form

mathslover (mathslover):

answer given?

mathslover (mathslover):

can u put that in a+b(sqrt{-1}) ? : P

OpenStudy (anonymous):

sorry I read the problem wrong. It is much simpler. i is not under the square root. it's \[\sqrt{3}i\] thanks for your help anyways

mathslover (mathslover):

medal?

OpenStudy (anonymous):

haha okay

mathslover (mathslover):

;)

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