Question

What is the exact value of the expression the square root 72. - the square root of 8. + the square root of 128.? Simplify if possible.

Answer 1

I think I know it

Answer 2

am I right?

Answer 3

\[12\sqrt{2}\]

Answer 4

factor the numbers first - try and get a perfect square in the factors
eg sqrt 72 = sqrt 36 * sqrt 2 = 6 sqrt 2

Answer 5

sqrt 8 = sqrt 4 * sqrt 2

can you simplify sqrt 128?

Answer 6

\[\sqrt{72}-\sqrt{8}+\sqrt{128}\]

this , right ?
can you factor,
72 =.... ?
8=...?
128 =...?

Answer 7

72 is 6 square roof of 2
8 is 2 square root of 2
128 is 8 square root of 2

Answer 8

good!
now just factor out sqrt 2 from each term :)
can u ?

Answer 9

whaa?

Answer 10

6 sqrt2 - 2 sqrt2 + 8 sqrt2

Answer 11

= ?

Answer 12

Ahhh.
So it is 12 square root of 2?

Answer 13

yes

Answer 14

I did that earlier, I just got confused on what he/she said. >.<

Answer 15

yes but you wrote it 3 times???

Answer 16

Sorry

Answer 17

What do you mean?

Answer 18

you wrote 12 sqrt2 3 times

Answer 19

Where?

Answer 20

in your 3rd post

Answer 21

It only shows up once for me.

Answer 22

well thats weird - the first 12 sqrt2 shows up in large font and the next 2 in a smaller font
- that so strange.....

Answer 23

I am haunted :O

Answer 24

lol