Question

Possible help with a few questions (refresher and check)

Answer 1

Divide and express the result in standard form.
6i/9-8i

Answer 2

I got -48+54i/145 but im incorrect

Answer 3

i thnk u right..

Answer 4

It says the correct answer is --> - 48/145 + 54i/145

Answer 5

oh...then tell me can't u write (a+b)/c= a/c + b/c

Answer 6

oh...then tell me can't u write (a+b)/c= a/c + b/c

Answer 7

I thought it was the same thing

Answer 8

standard form for a complex number is a + bi
where a is the real part and b the imag part.

they want you to divide through by the 145 so that you have a real part -48/145
and an imaginary part 54/145 i

Answer 9

Okay so I have to write it separate like that when it says standard form with a fraction?

Answer 10

yeah u hv to seperate in form of a+ib

Answer 11

yes

Answer 12

Great more stuff I have to remember.. Okay thank you for explaining that

Answer 13

yes, math has a lot of memorizing.
but it's not like learning French ... it seems like they have a different word for everything.

Answer 14

True.

Answer 15

Perform the indicated operation and write in standard form a+bi.

5 square root -64 + 6 square root -25 .... I cant remember how to solve this one -.-

Answer 16

@phi

Answer 17

write the \( \sqrt{-64} \) as \( \sqrt{64}\cdot \sqrt{-1} \)

Answer 18

\[5\sqrt{-64} + 6\sqrt{-25}\]\[=5\sqrt{64}\sqrt{-1}+6\sqrt{25}\sqrt{-1}\]This help any?

Answer 19

and use the short-hand "i" for sqr(-1)

Answer 20

That turns into
5 square root 64i +6 square root 25i right? Or am I way off?

Answer 21

yes, but sqr(64) is a nice number ditto sqr(25)

Answer 22

Yes, but you know sqrt(64) and sqrt(25)

Answer 23

Sorry. I'm out. Keep up the good work.

Answer 24

So now I have to make them into smaller numbers...

Answer 25

yes. you should know them, but you can use a calculator if you don't

Answer 26

8i and 5i

Answer 27

ok, and you now have
5*8*i + 6*5*i (I put in the multiply signs to make it clearer)
that can be simplified.

Answer 28

40i+30i
70i^2
70(-1)
-70

Answer 29

it is 40 i's plus 30 more i's

Answer 30

Oops so its 70i

Answer 31

yes

Answer 32

Okay thank you... 3 more to go