1.

Evaluate (root5 + 2 root2)sq - (root5 - root8)sq

Answer»

√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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