All they've done so far is simplify the stuff underneath the radical, you haven't taken any square roots yet.
Note that (16)(20) + (8)(32) = (16)(20) + (8)(2)(16) = (16)(20) + (16)(16) = 16(20 + 16) since there is a common factor of 16...
Hi All,
\sqrt{(16)(20) + (8)(32)}
1. \sqrt{(16)(20) + (16)(16)}
2. \sqrt{(16)(20+16)}
At this point, why the the 16 added to the 20 still under the square root? I understand this is because the square root of (16)(16) is 16, but if that's the case should it not be outside of the square root?
I can solve past this point.
Thanks,