If a-2-5-2-5 and b-2-5-2-5 find a-b3-

Given a=2 √(5)2 +√(5) and #160; b=2+ √(5)2 √(5) #160;so, a+b = 2 √(5)2 + √(5)+2+ √(5)2 √(5) #160; =4 #160; ∴ #160; (a+b) ...

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If a=2-√5/2...

Question

If $a = 2 - \sqrt{5} / 2 + \sqrt{5}$ and $b = 2 + \sqrt{5} / 2 - \sqrt{5}$ find $(a + b)^{3}$ .

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a+ b = 5, ab = 2 find $a^{3}$ + $b^{3}$

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b = \frac{2 - \sqrt{5}}{2 + \sqrt{5}}

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a = \frac{2 - \sqrt{5}}{2 + \sqrt{5}}

b = \frac{2 + \sqrt{5}}{2 - \sqrt{5}}

a^{2} - b^{2}

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