Question

Rationalize the denominator
1
√5-12-1​

Answer 1

Answer:

1/√5-12-1.

1/√5-11.

Rationalising denominator of √5-11 is √5+11.

Multiply numerator & denominator by √5+11.

1/√5-11×√5+11/√5+11.

√5+11/(√5)²-(11)². (Because (a+b)(a-b)=a²-b²).

√5+11/5-121.

√5+11/-116.

-√5+11/116. (Because +×-=-).

I think this is your answer.