Question

What is the conjugate of the square root of -15 ?

Answer 1

I think I know the answer, but if someone could explain it to me that would be awesome
:)

Answer 2

so when there is a+ib so the conjugate of this is a-ib --- i think

Answer 3

Well, I need to know if the answer is going to be the square root of -15i is 15i ?

Answer 4

as the conjugate

Answer 5

but there is just sqrt(-15)
yes ?

Answer 6

yes, and that turns into the square root of 15i

Answer 7

right?

Answer 8

no

Answer 9

sqrt(-15)= isqrt15

Answer 10

I don;t understand, would the negative qualify it to need an i ?

Answer 11

yes but i squared equal -1

Answer 12

Can you do that before finding the conjugate? I would understand if you did that afterwards.

Answer 13

ok

Answer 14

so sqrt(-15)= isqrt15

Answer 15

okay

Answer 16

When would you know to use an i in an equation?

Answer 17

when there is sqrt of one negativ number

Answer 18

for example sqrt(-9)=3i

Answer 19

Okay. So because you'd have to multiply the conjugate and the original equation together you'd change the i squared into a -1 and distribute?

Answer 20

or do you even need to think about the i at all?

Answer 21

write me please one example how do you think this ?

Answer 22

Okay.

For example, find the conjugate of the square root of -25.

My first step would be to change the negative into an i

Answer 23

and then get the conjugate

Answer 24

yes and will be ???

Answer 25

-25i

Answer 26

why ?

Answer 27

because the 25 was positive after I made the negative an i, so the negative didn't affect/apply to the 25

Answer 28

yes but there was sqrt(-25)
yes ???

Answer 29

Yes. Is it because there is a square root that you cannot do that?

Answer 30

For instance, if it the equation was simply 20i, the conjugate would be -20i

Answer 31

yes

Answer 32

and when in equation there is sqrt(-25) how many will be ?

Answer 33

?

Answer 34

so sqrt(-25)=5i so than the conjugate will be -5i

Answer 35

or not ???

Answer 36

The conjugate of the 5i would be, but that's not the conjugate for 25?

Answer 37

hope you understand it

Answer 38

conjugate for 25 ??? why ? you have wrote there firstly sqrt(-25)

Answer 39

Thanks for being patient with me and this equation ^^

Answer 40

yes. so : -25= 25i and the conjugate would be -25i?

Answer 41

no

Answer 42

just when is sqrt of one negativ number just than will have i

Answer 43

okay, so than the conjugate of -25 will be positive 25

Answer 44

under the square root sign ^^

Answer 45

no

Answer 46

:( oh man. So what is the conjugate?

Answer 47

of 5 is -5 but when there is sqrt(-9) so than sqrt(-9)=3i than the conjugate for 3i will be -3i

Answer 48

don't you have to find the conjugate of the question before solving?

Answer 49

becauss you have to find the conjugate and then mult them against eachother

Answer 50

yes

Answer 51

do you have there one exercise ?

Answer 52

?

Answer 53

I could give you the site so you can see what I'm talking about

Answer 54

it;s tdlc.com the login in is at the bottom: Your username is: kl1595
Your password is: wc684dd

Answer 55

so the conjugate for sqrt(-15)= -isqrt15

Answer 56

that's the answer? 8 squear root of 15 = square root of -15

Answer 57

for that particular question

Answer 58

what is 8 there ?

Answer 59

opps, - square root of 15 = square root of - 15

Answer 60

no

Answer 61

sqrt(-15)=isqrt15

Answer 62

oh!

Answer 63

now is understandably for you ?

Answer 64

that concept applies to my question as well right?

Answer 65

YES :D THANK YOU <3

Answer 66

yw

Answer 67

bye

Answer 68

Bye :)