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4-2√15 * 4+2√15 16 + 8√15 - 8√15 - 4√225
= 4√6 + 2√9√10 - 4√10 - 2√25√6
16 - 4*15
= 4√6 + 2*3 √10 - 4√10 - 2*5 √6
16 - 60
= 4√6 + 6√10 - 4√10 - 10√6
- 44
= - 6√6 + 2√10
-44
= 3√6 - √10
22
= 1 ( 3√6 - √10)
22