Question

rationlising factors of 1 upon 4 minus root 7 ____​

Answer 1

Answer:

$\frac{1}{4 - \sqrt{7} } \times \frac{4 + \sqrt{7} }{4 + \sqrt{7} } \\ = \frac{4 + \sqrt{7} }{ {4}^{2} + { \sqrt{7} }^{2} } \\ = \frac{4 + \sqrt{7} }{16 + 7} \\ = \frac{4}{23} + \frac{ \sqrt{7} }{23}$