Question

someone help me with square roots please?

Answer 1

What do you need? :)

Answer 2

okay, the first one is the square root of 49. i got 7. right?

Answer 3

the square root of 49 is 7, yes

Answer 4

okay, and for the next one. square root of 5.29. i got 2.3. but i think we are suppose to turn it into a fraction?

Answer 5

2.3 is correct. Do you know how to turn a decimal into a fraction?

Answer 6

no :(

Answer 7

Hint...what is 2.3 times 10? 23 right?

so how do we write it as a fraction?

\[\large \frac{23}{10}\]

right? since 2.3 times 10 = 23 ...that means that 23 divided by 10 = 2.3 :)

Answer 8

so the answer is 23 over 10?

Answer 9

If you are supposed to write it as a fraction...then yes :)

Answer 10

yes but you'll have to reduce it.

Answer 11

and for the next one. it's the square root of negative 78. i got -8.8. -88 over 10?

Answer 12

^reduce it? you mean to a mixed fraction? @KiaKat ?

Answer 13

Noooooo not quite on that last one

we cannot take the square root of negative numbers without introducing imaginary numbers

Answer 14

I'm so frustrated. I can't do this.

Answer 15

Yes. Most math textbooks want you to reduce it down to a mixed fraction, but if you wanted to you could put it as a mixed fraction and then put "or 23/10"

Answer 16

Dont get frustrated :)

honestly the answer is just adding an 'i' at the end

\[\large \sqrt{-78} = \sqrt{78 \times -1} = 8.8\sqrt{-1}\]

what is the square root of -1? that (as you can look up...= 'i'

\[\large 8.8i\] would be your final answer

Answer 17

i? we didn't learn that. i got -8.8 as an answer and i guess we have to put it in fraction form

Answer 18

If they're just doing fractions and square roots, i dont think they've gotten to imaginary numbers yet

Answer 19

so if it's -8.8 what would that be in fraction form?

Answer 20

thats a good question, because if it's negative it would have to be an imaginary number...

Answer 21

what about the square root of 36/81? i got 2/3. would i just leave it at that?

Answer 22

how did you get 2/3??

Answer 23

i took the square root of 36 over 81

Answer 24

haha now im confused.

@johnweldon1993

Answer 25

\[\large \frac{\sqrt{36}}{\sqrt{81}} = \frac{6}{9} = \frac{2}{3}\]

Answer 26

ohhhhh

Answer 27

yes, that's what i got. do i just leave it as 2/3?

Answer 28

yeah probably then

Answer 29

Indeed just 2/3

Answer 30

thank you!

Answer 31

Of course!

and sorry...but definitely write 8.8i for that second one....your teacher knows its right and should go over it