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OpenStudy (anonymous):
(5+√(2))(5-√2) multiply
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OpenStudy (anonymous):
(5+√(2))(5-√2) =25-5√2+5√2-2 =23
OpenStudy (amistre64):
conjugates are the factored form of a difference of squares
OpenStudy (amistre64):
(a^2 - b^2) <=> (a-b)(a+b)
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