Mathematics · Algebra

If a = (√5 + 2) / (√5 - 2) and b = (√5 - 2) / (√5 + 2), then the value of 2a2 + 2b2 - 5ab is equal to:

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639

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If a = (√5 + 2) / (√5 - 2) and b = (√5 - 2) / (√5 + 2), then the value of 2a2 + 2b2 - 5ab is equal to:

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If a = (√5 + 2) / (√5 - 2) and b = (√5 - 2) / (√5 + 2), then the value of 2a2 + 2b2 - 5ab is equal to:

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