To add or subtract radicals, the degree and radicand must be the same. For example, \(2\sqrt{3} + 3\sqrt{3} = 5\sqrt{3}\) but \(2\sqrt{2} + 2\sqrt{3}\) cannot be added because they have different radicands.
What is \( 2 \)\( \sqrt{20} \) + \( 5 \)\( \sqrt{5} \)
| 7\( \sqrt{20} \) | |
| 10\( \sqrt{4} \) | |
| 9\( \sqrt{5} \) | |
| 7\( \sqrt{5} \) |