Question

Simplify the following complex expressions by adding, subtracting, or multiplying as indicated.

Answer 1

\[(4-i)(2+i)\]

Answer 2

\( 9+2i \)

Answer 3

ummm y wld u say that?

Answer 4

i like multiplied the two expressions and got smth diif

Answer 5

-i^2+2i+8
I just foiled

Answer 6

I have assumed \( i =\sqrt{-1} \)

Answer 7

ohhhh r u suppossed to do that? I dont really know how to work with imaginary numbers :D

Answer 8

what kind of simplification??

Answer 9

well either you can multiply the two expressions

Answer 10

Pippa that is correct that i represents \[\sqrt{-1}\]

Answer 11

lol fool always wins :D

Answer 12

so the answer was the one you posted above?

Answer 13

but fool if you plugged in i=sqrt(-1) y do u still have an i in ur answer?

Answer 14

So wait is fool correct or are you correct pippa?

Answer 15

i think pippa is correct

Answer 16

\[(-5i)^3\]

Answer 17

umm u want to lsove this also?

Answer 18

Yes please?

Answer 19

is that power 2 or 3?

Answer 20

http://www.wolframalpha.com/input/?i=i+%3D+Sqrt%5B-1%5D%3B+Expand%5B%284+-+i%29+%282+%2B+i%29%5D

Am I missing something?

Answer 21

125i

Answer 22

Even simply http://www.wolframalpha.com/input/?i=Expand%5B%284+-+i%29+%282+%2B+i%29%5D

Answer 23

It is to the power of 3.

Answer 24

then i think answer is : 125i

Answer 25

I have one more...

Answer 26

\[11i^{314}\]

Answer 27

-11

Answer 28

LOL I guess i dont know how to work wth imaginary numbers