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(a) v 5 +v 20 + v 45. simplify it

please do it as fast as possible because i dont understand this question                                                                                                
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2 Answers

If the numbers are radicals the simplification that I see is
V5 +V20 +V45
Turns to be
I believe the answer is:
v5(1+v15+v40), not v5(1+v4+v9) since in general, abac = ab+c