Question 70324
(5 times sq rt of 3 + 3 times sq rt of 5)(squared) 
work:
(25x9) + 30 times sq rt of 15 + (9x5) 
answer:
270 + 30 times sq rt of 15 
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(5sqrt3 + 3sqrt5)

= (5sqrt3)^2 +2(5sqrt3)(3sqrt5) + (3sqrt5)^2

= 25*3 + 2*15*sqrt15 + 9*5

= 75 +30sqrt15 + 45

= 120 + 30sqrt15
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Cheers,
stan H.