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 9\( \sqrt{8} \) x 9\( \sqrt{5} \)?
| 18\( \sqrt{8} \) | |
| 18\( \sqrt{40} \) | |
| 81\( \sqrt{13} \) | |
| 162\( \sqrt{10} \) |