Simplify (2root3+6root5)(5root2-3root3)
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(2√3 + 6√5) (5√2 - 3√3)
= 2√3(5√2 - 3√3) +6√5 (5√2 - 3√3)
= 10√6 - 6 × 3 + 30√10 - 18√15
= 10√6 - 18 + 30√10 - 18√15
Hope that helps.
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