Question

Find (√2 + 2√2)²
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Answer 1

Answer:

=2+8+8

=18

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Answer 2

Using identity (a +b)² = a² +b² +2ab

√2 ²+ (2√2)² + 2(√2)(2√2)

=2 + 4(2) + 4(2)

=2 + 8 + 8

= 18

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