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OpenStudy (anonymous):
(4-√2) (5+√2)
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OpenStudy (anonymous):
4(5)+4√2-5√2-(√2)(√2) = 20-√2-2 = 18-√2
OpenStudy (anonymous):
\[\Large (4-\sqrt2)(5+\sqrt2)=20+4\sqrt2-5\sqrt2-(\sqrt2)^2\] \[\Large 18-\sqrt2\]
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