Can we find a number that goes in this?

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Yepperooski!

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Now that we're thinking like this, let's go back and look at square roots...

01-Radicals-19.gif

Can we find a number that goes in here?

01-Radicals-20.gif

By the way, this thing is really

01-Radicals-21.gif

But, square roots are so commonly used, that we just leave off the 2 and assume it's there.