To multiply or divide radicals, multiply or divide the coefficients and radicands separately: \(x\sqrt{a} \times y\sqrt{b} = xy\sqrt{ab}\) and \({x\sqrt{a} \over y\sqrt{b}} = {x \over y}\sqrt{a \over b}\)
What is 8\( \sqrt{9} \) x 7\( \sqrt{9} \)?
| 15\( \sqrt{9} \) | |
| 15\( \sqrt{81} \) | |
| 168\( \sqrt{9} \) | |
| 56\( \sqrt{18} \) |