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 5\( \sqrt{7} \) x 4\( \sqrt{9} \)?
| 9\( \sqrt{9} \) | |
| 20\( \sqrt{7} \) | |
| 20\( \sqrt{16} \) | |
| 60\( \sqrt{7} \) |