Question

What would be the answer for this expression?

Answer 1

\[\sqrt{20}+\sqrt{8}-\sqrt{80}\]

Answer 2

\[\Large\rm \sqrt{20}=\sqrt{4\cdot5}\]Hmm does sqrt(2) contain any perfect squares?
Anything we can take out of the root?

Answer 3

\[\sqrt{4}=2\]

Answer 4

\[\Large\rm \sqrt{20}=2\sqrt{5}\]Mmm ok great! that allows us to take the 4 out of the root as a 2.

Answer 5

How bout the 8? :U
Any magic we can do there?\[\Large\rm \sqrt{8}=\sqrt{4\cdot2}\]

Answer 6

\[\sqrt{4\times2} \]

Answer 7

Sorry, my internet is kind of bad today :(

Answer 8

@zepdrix?

Answer 9

It's probably not your internet :c it's the website...

Answer 10

Can we take a perfect square out of the 8?

Answer 11

once you have a common number under the radical you can add and subtract the numbers outside the radical
for example 3sqrt5-sqrt5=2sqrt5

Answer 12

No, we can't have a perfect square root of 8.