1. anonymous

$240=16\times 15$ is a hint

2. anonymous

$16*\sqrt{15}$

3. anonymous

is that it?

4. anonymous

$\sqrt{240}=4\sqrt{15}$

5. anonymous

safiah

6. anonymous

when you break it down and there is two groups of 2 do you just do 2(2)?

7. asnaseer

@satellite73 gave you a very big hint at ow to solve this. you need to make use of the rule $$\sqrt{a\times b}=\sqrt{a}\times\sqrt{b}$$. so, in your case, we have $$\sqrt{240}=\sqrt{16\times15}=\sqrt{16}\times\sqrt{15}=4\times\sqrt{15}=4\sqrt{15}$$