Question

plz solve this..it's urgent ..from number system

Answer 1

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Answer 2

Here is your answer :-

$\frac{7 + \sqrt{5} }{7 - \sqrt{5} } \times \frac{7 + \sqrt{5} }{7 + \sqrt{5} } - \frac{7 - \sqrt{5} }{7 + \sqrt{5} } \times \frac{7 - \sqrt{5} }{7 - \sqrt{5} } = a + 7 \sqrt{5} b \\ \frac{49 + 5 + 14 \sqrt{5} }{49 - 5} - \frac{(49 + 5 - 14 \sqrt{5} }{49 - 5} = a + 7 \sqrt{5} b \\ \frac{54 + 14 \sqrt{5} - 54 + 14\sqrt{5} }{44} = a + 7 \sqrt{5} b \\ \frac{28 \sqrt{5} }{44} = a + 7 \sqrt{5} b$
so, on comparing

a = 0
b = b = 1/11.

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