Question

Solve please don't give inrrelvent answers ....

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Answer 1

Answer:

$\sqrt{x {}^{2} - 1} \\ = \sqrt{{x}^{2} - {1}^{2} } \\ = \sqrt{(x + 1)(x - 1) } \\ = \sqrt{(x + 1)(x - 1)} + \sqrt{x - 1} \\ \sqrt{x - 1} ( \sqrt{x + 1} + 1) \div \sqrt{ {x}^{2} - 1} \\ \sqrt{x - 1} ( \sqrt{x + 1} + 1) \div \: (x + 1)(x - 1) \\ = \sqrt{x + 1} \: is \: the \: answer$

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