√8 = 2√2 only...So,(√5 + 2√2)² - (√5 - 2√2)² is much like a²-b² right? Where a = (√5 + 2√2) and B = (√5 - 2√2)We know a²-b² = (a+b)(a-b)... ANSWER : (√5)(4√2) = 4√10
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