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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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Francisco E. | Francisco; Civil Engineering, Math., Science, Spanish, Computers.Francisco; Civil Engineering, Math., Sci...
5.0 5.0 (1 lesson ratings) (1)
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If the numbers are radicals the simplification that I see is
V5 +V20 +V45
Turns to be
V5(1+V15+V40)
 
James F. | Statistics Graduate Student and TutorStatistics Graduate Student and Tutor
5.0 5.0 (6 lesson ratings) (6)
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I believe the answer is:
 
v5(1+v15+v40), not v5(1+v4+v9) since in general, abac = ab+c

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