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\( \sqrt{7} \) x 5\( \sqrt{7} \)?
| 40\( \sqrt{7} \) | |
| 40\( \sqrt{14} \) | |
| 13\( \sqrt{49} \) | |
| 280 |