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Multiply and simplify

(9square root 6 - 4 square root 10)
(square root 6 - 7 square root 10)
I have been stumped and working on all day. Any suggestions?

1 answer

(9√6 - 4√10)(√6 - 7√10)
= 9√36 - 63√60 - 4√60 + 28√100
= 54 - 67√60 + 280
= 334 - 67√4√15
= 334 - 134√15
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