Hello. Is it possible to solve this problem only by factoring, rationalizing or by change of variable (substition)? If so, can you please show your

Hello. Is it possible to solve this problem only by factoring, rationalizing or by change of variable (substition)? If so, can you please show your step by step on how you would tackle this problem? I tried rationalizing both the numerator and denominator but to no avail, I keep getting 0 on the denominator.