2[√(2+√5)][√(2-√5)]
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2[√(2+√5)][√(2-√5)]
=2[√(2+√5)(2-√5)]
=2√{(2²)-(√5)²}
=2√(4-5)
=2√(-1)
=2i where i=√(-1)
=2[√(2+√5)(2-√5)]
=2√{(2²)-(√5)²}
=2√(4-5)
=2√(-1)
=2i where i=√(-1)
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