Can someone help me with this question. I'll give brainliest answer to whoever helps me.

The square root of 20 is 4.472135... so, you have to solve what of your possible solutions could be the right answer (it's best to use a graphing calculator). We already know it not A, so that's off the list because the square root of 20 is already greater than 4. We then move onto C or 2root5 which we also get 4.472135... (by doing 2 * the square root of 5). We then move onto B and find that 5root2 is 7.07 (by multiplying 5 by the square root of 2). So B is off the plate. Lastly, is 20 = to the square root of 20. No, we already established that in the beginning of the problem. So, overall the answer is C or 2root5.

legomyego180 legomyego180 · Answer 2 · 2019-01-07T03:19:21+01:00

legomyego180 legomyego180

07-01-2019

[tex] \sqrt{20} = \sqrt{5 \times 4} \\ \sqrt{5 \times 4} = \sqrt{5 \times {2}^{2} } \\ \sqrt{5 \times {2}^{2} } = 2 \sqrt{5} [/tex]

So 2√5 is the correct answer.
It's very important to remember that you can multiply and divide numbers inside of a square root to simplify it or expand it (as I did above) but not add and subtract.

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