Question

What is the Square root of -72?

Answer 1

@ganeshie8 @girlwithsquirrels14 @Ashleyisakitty

Answer 2

72 = 36x2

Answer 3

\(\large \sqrt{-72} \)

\(\large \sqrt{-36 \times 2} \)

Answer 4

-6 sqrt 2
6 sqrt -2
6sqrt 2i
6i sqrt 2

Answer 5

\(\large \sqrt{-72} \)

\(\large \sqrt{-36 \times 2} \)

\(\large \sqrt{-1 \times 36 \times 2} \)

Answer 6

Those are the options

Answer 7

-72 = 8.4852814

Answer 8

u want ansurr
or learn how to do this ? :)

Answer 9

Learn how please

Answer 10

u sure ? dont lie

Answer 11

Yeah I want to understand!

Answer 12

pull the 36 out, it becomes 6 ?

Answer 13

good :)

\(\large \sqrt{-72} \)

\(\large \sqrt{-36 \times 2} \)

\(\large \sqrt{-1 \times 36 \times 2} \)

\(\large 6\sqrt{-1 \times 2} \)

Answer 14

see if above steps make sense

Answer 15

Eh not really ! I dont know this

Answer 16

\(\large \sqrt{-72} \)

\(\large \sqrt{-36 \times 2} \)

Answer 17

till that step u okays ? :)

Answer 18

yess!

Answer 19

since, sqrt(36) = 6

it becomes :-

\(\large 6 \sqrt{-1 \times 2} \)

Answer 20

remember this for the rest of ur course time : sqrt(-1) = i

so it becomes :-

\(\large 6 i \sqrt{2} \)

Answer 21

Oh okay . And what are the steps for solving 2 divided by 2 + 5i?

Answer 22

@ganeshie8

Answer 23

multiply top and bottom wid conjugate

Answer 24

\(\large \frac{2}{2+5i} \)

multiply top and bottom wid conjugate 2-5i

\(\large \frac{2}{2+5i} \times \frac{2-5i}{2-5i}\)

Answer 25

wait so 4 and 10i

Answer 26

\(\large \frac{2}{2+5i} \)

multiply top and bottom wid conjugate 2-5i

\(\large \frac{2}{2+5i} \times \frac{2-5i}{2-5i}\)

\(\large \frac{2(2-5i)}{(2+5i)(2-5i)}\)

since, \((a+ib)(a-ib) = a^2+b2, \)

\(\large \frac{2(2-5i)}{2^2+5^2}\)

\(\large \frac{4-10i}{29}\)

Answer 27

Wow thats tricky for me ..I see what you mean tho . thank you !

Answer 28

glad u cud make some sense of that :) yw !