Question

Rationalise the denominator as per necessary and simplify.​

Answer 1

Answer:

$8\sqrt{7}$

Step-by-step explanation:

$\frac{21}{\sqrt{7} } * \frac{\sqrt{7} }{\sqrt{7} }$ = $\frac{21\sqrt{7} }{7}$

$\frac{21\sqrt{7} }{7}$ = $\frac{147\sqrt{7} }{14}$

$\frac{147\sqrt{7} }{14} - \frac{35\sqrt{7} }{14}$

$\frac{112\sqrt{7} }{14}$

$8\sqrt{7}$