Radical neck dissection is an operation used to remove cancerous tissue in the head and neck.
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Here is an example, radical 20 plus radical 5. Now radical 20 is 2(radical 5) so we can add radical 5 and 2 radical 5 and we have 3 radical 5.
radical 3 or 6
2 times radical 5 or about 4.472135955
2i radical 5 * * * * * No. it is ± i*radical(25) which is ± 5i. Not sure why the answer is requireed in radical form.
2 radical 30