Can you please tell me How (2√5)^2 =20 ?
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Answer: like this
(2√5)² = (2√5) * (2√5) = 2 * 2 * √5 * √5
=> 4 * √5² [√5² = √25 = 5]
=> 4 * 5 = 20
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here is your answer.
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