Question

for any two real numbers a and b and positive integers is n

Answer 1

You have the following expression:

$-\sqrt[]{63}$

In order to simplify the previous expression, consider that 63 = 7*9 = 7*3^2.

Then, you have:

$-\sqrt[]{63}=-\sqrt[]{7\cdot9}=-\sqrt[]{7\cdot3^2}=-3\sqrt[]{7}$

Hence, the simplified expression is

-3√7