Question

squrt(-a)*squrt(-b) is equal to squrt (-a)(-b) or not ?

Answer 1

not it isn't.
it is equal to -sqrt(-a)(-b)

Answer 2

no it is equal to -1*squrt(a)(b)

Answer 3

yes, that is the same as what I wrote. (-a)(-b)=(a)(b)

Answer 4

i think we cant not multiply two numbers which are negative inside the sqrt...thats what the logic, i guess...what do u say ?

Answer 5

you can do all the arithmetic functions within the square roots. sqrt(20) = sqrt((4)(5))

Answer 6

sqrt(9) = sqrt(5+4)

Answer 7

sqrt(9) is NOT equal to sqrt(4)+sqrt(5)

Answer 8

what u told ll apply for positive numbers..not for negatives...otherwise the question what i posted would have a direct answer

Answer 9

hey actually i saw this, when iam reading abt complex numbers

Answer 10

yes, sqrt of a negative number is imaginary.
so when you multiply an imaginary number with another imaginary number you get negative(their product)
whereas if sqrt(-5)(-4) is given, it means you first multiply what is within the sqrt and THEN calculate the square root. It is kind of an extension of the BODMAS rule.

Answer 11

if is so...then y sqrt(-a)*sqrt(-b) is not equal to sqrt(-a)(-b)....

Answer 12

because you evaluate what is within the square root and then take its square root
so sqrt(-a) X sqrt(-b) = i sqrt(a) X i sqrt(b) = i^2sqrt(ab)= -sqrt(ab)

Answer 13

sqrt(number) is also a number. you must treat sqrt(number) as a number.

Answer 14

sqrt(4) must be treated the same way you treat 2. so sqrt (4) X sqrt(4) means you are multiplying two separate numbers.

Answer 15

you first evaluate the sqrt(4) and THEN do the multiplication. so sqrt(4) X sqrt(4) = 2 X 2 = 4.

Answer 16

iam clear upto the part...that...sqrt(-a)*sqrt(-b) is equal to -1*sqrt(a)*sqrt(b)....am i right ?

Answer 17

so sqrt(-a) X sqrt(-b) means you are taking the number sqrt(-a) and multiplying it by the number sqrt(-b).
sqrt(-a) is the number i sqrt(a).
sqrt(-b) is the number i sqrt(b).
so when you multiply these two numbers you get i^2 sqrt(a)sqrt(b) = -1sqrt(ab)

Answer 18

whereas when you are evaluating sqrt(-a X -b), you treat this as a number too, it is the number sqrt(-a X -b) = sqrt( ab)

Answer 19

yes exactly ur right...i agree with u completely..infact thats what i was saying u right ?

Answer 20

no, you were saying that you cannot perform multiplication within square roots, which you can.

Answer 21

wait wait...

Answer 22

if those two r individually correct, then y iam not able to write LHS=RHS, assuming LHS = sqrt(-a)*sqrt(-b), RHS=sqrt(-a)*(-b)....

Answer 23

I think agian v cam to first...

Answer 24

because LHS and RHS have two different meanings. LHS means you are taking the number sqrt(-a) and multiplying it with the number sqrt(-b)
RHS means you are evaluating the number sqrt(-a X -b) which is the same as the number sqrt(ab)

Answer 25

then what abt "-" sign...so u mean to say -sqrt(a*b) is equal to sqrt(-a*-b) ?

Answer 26

sqrt (a) means square root of the number a.
sqrt(-a) means the square root of the number -a.
sqrt(-a X -b) means square root of the number (-a x -b) which is the same as square root of the number ab.

Answer 27

hey i think i did typing mistake , while writing parentheses....but i understood ur concept....u r right...i conveyed u a wrong message without including brackets....hope so...but iam clear how "-" has come...

Answer 28

so you have to first evaluate what number it is you are taking the square root of, and then square root it.

Answer 29

r u a math student ?....where r u from ?

Answer 30

google sqrt(-1*-4) and see what the answer is
google sqrt(-1) * sqrt(-4) and see what the answer is.

Answer 31

do it now and you will see what I am talking about.

Answer 32

ok i ll do it..

Answer 33

just copy and paste what I typed there into google and press enter. google has a built in calculator

Answer 34

no, i'm not a math student. I am from India.

Answer 35

answer is 2, -2

Answer 36

for ur 2 equations

Answer 37

see what I meant? in the first case, the product of (-1 * -4) was done first and then the square root was applied to that number. (-1*-4) = 4. so sqrt(4) = 2

in the second case, sqrt(-1)*sqrt(-4), the square roots were evaluated first, which is i and 2i and THEN they were multiplied. which means i*2i = 2i^2 = -2.

Answer 38

ya i got it..

Answer 39

okay great. cheers!

Answer 40

r u an engineering student ? ....math is ur favorite subject ?

Answer 41

I am not a student. I finished graduation last year. Physics is my favorite subject. I just come here to help out sometimes.

Answer 42

what about you?

Answer 43

ok ...i finished my under graduation in Mechanical engineerign from Hyderabad...presently working in a company, chennai....going to do my MS in Industrial Engineering in US...by this july end iam gonna fly...thats y iam just revising my basics before my classes ll start...Maths is hobby..

Answer 44

oh okay. which university?

Answer 45

JNTU,Kukatpally...do u know it ?

Answer 46

oh yes. I know that university. One of my friend's sister studied there.
but i meant which university are gonna do IE in US?

Answer 47

okay...North Carolina State University (NCSU), Raleigh....do u know abt it ?

Answer 48

Oh NCSU, I see. Good, that is a nice university. One of my friends graduated from there. Pack warm clothes. It is pretty cold in NC.

Answer 49

ya its a good university....i love the ambiance there...it ll give u a blend of all the weathers....u can really enjoy...Btw...May-18th is my VISA ...bit nervous..

Answer 50

oh, don't be nervous. It was easy for me. Just don't stammer and show nervousness when the guy asks you anything. takes 5 minutes max. where are going for VISA? chennai consulate?

Answer 51

ya Chennai Consulate..

Answer 52

actually, I just saw the temperatures. not so bad. 32 F is not that bad. It gets that cold here out in the west sometimes.

Answer 53

okay, well all the best.

Answer 54

from which university did u graduated ?

Answer 55

USC

Answer 56

ok
so ur in Cali now ?

Answer 57

yeah. I live in Orange County.

Answer 58

ohh cool

Answer 59

actually, I have to move to san francisco by next month.

Answer 60

y so ?..r u working ?

Answer 61

yes. As I said, I graduated last year.

Answer 62

okkkk

Answer 63

which branch r u ?...whats ur major ?

Answer 64

I did computer engineering. did thesis on wireless networking.

Answer 65

ok

Answer 66

basically r u a telugu guy ?

Answer 67

yes.

Answer 68

ok

Answer 69

But I haven't lived in Andhra for more than 2 years.

Answer 70

ohhh...where u used to stay ? atleast do u know telugu r not ?

Answer 71

I used to stay in rajamundry for less than 2 years. but I have lived most of my life in Dehradun and chennai, and now LA. and yes, we speak telugu at home.

Answer 72

I speak telugu, tamil and hindi fluently.

Answer 73

ur not sleeping by this time ?

Answer 74

what about you? how long have you stayed in hyderabad?

Answer 75

I slept in the night for a bit. I can't sleep more, so I decided to stay up and go to office directly tomorrow.

Answer 76

i was in HYD for 7 years...in Chennai for 1 year....i know telugu,tamil,english,hindi....little bit kanada

Answer 77

oh good. that will come in handy here. everyone assumes you know hindi.

Answer 78

alright, it was nice chatting with you. I'm gonna go make some food and have a couple of smokes. its a beautiful night here.

All the best for your visa interview! Don't be nervous about it. I'm sure you will get it.

Answer 79

hey really thanks...whats ur name ?...dont scold me as iam asking at last ...

Answer 80

I'm aditya. and i already know yours.

Answer 81

thanks...

Answer 82

bye now.

Answer 83

hey bye bye...