Answer:
[tex] \sqrt{210} [/tex]
Step-by-step explanation:
Let's look at the prime factors of 210.
210 = 2 * 3 * 5 * 7
[tex] \sqrt{210} = \sqrt{2 \times 3 \times 5 \times 7} = \sqrt{210} [/tex]
Since no factor appears more than once, this radical cannot be simplified.