Question

Rationalize the denominator of 1+√7/1-√7?

Answer 1

first of all multiplying of both numerator and denominator but 1--root 7 will sign change and will sign add then solve

Answer 2

$\frac{1 + \sqrt{7} }{1 - \sqrt{7} } \times \frac{1 + \sqrt{7} }{1 + \sqrt{7} } = \frac{1 + 2 \sqrt{7 } + 7}{1 - 7} = \frac{8 + 2 \sqrt{7} }{ - 6} = \frac{ - 8 - 2 \sqrt{7} }{6}$