radical 15 + radical 200

i dont know how to do this please help
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1 Answer

sqrt(15) + sqrt(200)
= sqrt(3 * 5) + sqrt(100 * 2)
= sqrt(3 * 5) + sqrt(100)*sqrt(2)
= sqrt(3 * 5) + 10sqrt(2)
= sqrt(3)*sqrt(5) + 10sqrt(2)

And nope, you cannot combine the two terms, unless you take sqrt(5) out from both sides.
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