Question

Plz help fast Simplify √8•6√5=

Answer 1

use a calculator

Answer 2

no find the square root of 8 then multiply by 6 then multiply by the square root of 5

Answer 3

\[\sqrt{8}*6*\sqrt{5} = 6*\sqrt{8}*\sqrt{5} = 6*\sqrt{8*5} = 6*\sqrt{40}\]\[ = 6*\sqrt{4*10} = 6*\sqrt{4}*\sqrt{10} = 6*2*\sqrt{10} = \]

Answer 4

wolframalpha.com agrees with my answer

Answer 5

The problem asks to simplify, not find the decimal...

Answer 6

oh very true

Answer 7

as both \(\sqrt{8}\) and \(\sqrt{5}\) are irrational, it is not possible to multiply them accurately except by doing so symbolically, which is what we did.

Answer 8

I should say exactly, not accurately...

Answer 9

So what's my answer going to be please

Answer 10

\(6*2*\sqrt{10} = \) ?

what is \(6*2=\)
what do you get if you multiply that by \(\sqrt{10}\)

hint: \(a * \sqrt{b} = a\sqrt{b}\)

Answer 11

2^2=2

Answer 12

I really don't know

Answer 13

You don't know what \(6*2=\)
seriously?

Answer 14

12

Answer 15

okay, and a number times a square root of a number is written number square root other number.

\[2*\sqrt{3} = 2\sqrt{3}\]

\[12 * \sqrt{10} = \]

Answer 16

I Don't know

Answer 17

Is it the finale answer √120

Answer 18

I can't make it any plainer than I just did...if you multiply a number by the square root of another number, you just write down the first number followed by the square root sign and the other number, just like I did for 2 * the square root of 3.

Answer 19

No, if you move a number from the inside of the square root to the outside, you have to take the square root of the number.
\[\sqrt{32} = \sqrt{16*2} = \sqrt{16}*\sqrt{2} = 4*\sqrt{2} = 4\sqrt{2}\]

Going the other way, if you move a number inside the square root sign, you have to square it:

\[10\sqrt{2} = \sqrt{10*10}*\sqrt{2} = \sqrt{10*10*2} = \sqrt{200}\]

So, if you wanted to move that \(12\) inside the square root sign, it would be:
\[12\sqrt{10} = \sqrt{12*12}*\sqrt{10}=\sqrt{12*12*10}= \sqrt{1440}\]

Answer 20

Your answer is simply \(12\sqrt{10}\) — that is the simplified form of \(\sqrt{8}*6*\sqrt{5}\)

Answer 21

Ohh ok thank you

Answer 22

I suggest you ask your teacher to go over this with you again, as it is very important, and you'll have no end of trouble if you make mistakes...

Answer 23

Ok thanks I am homeschool

Answer 24

Hmm. Have you tried watching the Khan Academy ( http://khanacademy.org) videos? They are generally very good, I find. Here's the section on square roots:

https://www.khanacademy.org/math/pre-algebra/exponents-radicals/radical-radicals/v/understanding-square-roots

I think you would probably be well-served to go through the whole pre-algebra lecture series. Not all in one afternoon, of course! :-)

Answer 25

Thanks