Question

Help!
-5i-i/-2+7i

Answer 1

you need to turn the denominator into a real number.
so, do you what to do to turn (-2+7i) into a real number?
(you need to multiply by something)

Answer 2

multiply top and bottom by -2-7i ?

Answer 3

correct

Answer 4

i got (-5-i)(-2-7i)/53

Answer 5

you should be able to multiply out the numerator as well and simplify further

Answer 6

so i guess if u foil the top then u'll get 10+35i+2i+7i^2

Answer 7

i don't get this part

Answer 8

10+37i+7i^2

Answer 9

remember i^2 = -1

Answer 10

oh yeah

Answer 11

would it be 3+37i ?

Answer 12

correct - but don't forget the denominator

Answer 13

oh yea

Answer 14

:)

Answer 15

so i guess it just 3+37i/53 ?

Answer 16

thats it - well done!

Answer 17

thank you !!

Answer 18

yw