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(5 + V7) x (5 - √7)
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(5+√7)(5-√7)
= 25-5√7+5√7-7
= 25-7
= 18
OR
Using (a+b)(a+b) = a²-b² identity,
(5+√7)(5-√7)
= (5)²-(√7)²
= 25-7
= 18
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