Question

simplify √-49 divided by (3+4i)-(2-5i)

Answer 1

please answer

Answer 2

alright so we know √-49 = √-1*√49 = i7 this is what the numerator simplifies too, the bottom simplifies to 1 - i

so we get 7i/1-i

Answer 3

sorry the bottom is 1+9i

Answer 4

\[\frac{i7}{1+i9}\]

Answer 5

that not one of the answer though

Answer 6

whats the answer they may have multiplied the top and the bottom by something

Answer 7

is it -7/(i-9) ?

Answer 8

7+7i divided by 2?

Answer 9

63+7i divided by 82

Answer 10

-7 + 7i divided by 2

Answer 11

-63 + 7i divided by 82

Answer 12

those are the choices...

Answer 13

\[\frac{63+i7}{82}\]

Answer 14

thats it kropot thanks!!

Answer 15

You're welome :)

Answer 16

can you explain it?
im so confused

Answer 17

they multiplied the top and the bottom by (1 - 9i)

Answer 18

so in this case we got 7i/1+9i and now if multiply the top and the bottom by (1 - 9i)
we get the bottom to be 1+81 =82

and the top to be 7i(1-9i) = 7i+63
so therefore

the final answer is 7i+63/82 :)

Answer 19

Sure.\[\frac{\sqrt{-49}}{(3+4i)-(2-5i)}=\frac{7i}{3+4i-2+5i}\]
Do you follow?