## anonymous 4 years ago Simplify the following complex expressions by adding, subtracting, or multiplying as indicated.

1. anonymous

$(4-i)(2+i)$

2. anonymous

$$9+2i$$

3. anonymous

ummm y wld u say that?

4. anonymous

i like multiplied the two expressions and got smth diif

5. anonymous

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

6. anonymous

I have assumed $$i =\sqrt{-1}$$

7. anonymous

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

8. anonymous

what kind of simplification??

9. anonymous

well either you can multiply the two expressions

10. anonymous

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

11. anonymous

lol fool always wins :D

12. anonymous

so the answer was the one you posted above?

13. anonymous

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

14. anonymous

So wait is fool correct or are you correct pippa?

15. anonymous

i think pippa is correct

16. anonymous

$(-5i)^3$

17. anonymous

umm u want to lsove this also?

18. anonymous

19. anonymous

is that power 2 or 3?

20. anonymous
21. anonymous

125i

22. anonymous
23. anonymous

It is to the power of 3.

24. anonymous

then i think answer is : 125i

25. anonymous

I have one more...

26. anonymous

$11i^{314}$

27. anonymous

-11

28. anonymous

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