Question 323554
(5radical3-10radical2)*(4radical3+8radical2) 
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(5sqrt(3) - 10sqrt(2))*(4sqrt(3) + 8 sqrt(2)
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Use FOIL to get:
F: 20*3
O: 40sqrt(6)
I: -40sqrt(6)
L: -80*2
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Combine to get: 60-160 = -100
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Cheers,
Stan H.