Mathematics · Algebra

If √5 - 1√5 + 1 - √5 + 1√5 - 1 = a + b√5, then the value of (a + b)(a - b) ÷ (a2 + b2) is:

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10
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-1

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If √5 - 1√5 + 1 - √5 + 1√5 - 1 = a + b√5, then the value of (a + b)(a - b) ÷ (a2 + b2) is:

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If √5 - 1√5 + 1 - √5 + 1√5 - 1 = a + b√5, then the value of (a + b)(a - b) ÷ (a2 + b2) is:

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