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 7\( \sqrt{4} \) x 4\( \sqrt{5} \)?
| 56\( \sqrt{5} \) | |
| 11\( \sqrt{20} \) | |
| 11\( \sqrt{4} \) | |
| 28\( \sqrt{4} \) |