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(√(7)+2√(3)multiply by its conjugate and then simplify
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by Tina181 at March 03, 2011

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(√(7)+2√(3)) is the conjugate of (√(7)-2√(3))Multiplying them together gets you(√(7))^2 - 2*2√(3)√(7) + 2√(3)^2 = 7 + 12 = 19

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John_Doe March 03, 2011