Question

Rationalise the denominator of  1/√9-√8​

Answer 1

Step-by-step explanation:

1/√9-√8

we multiply and divide by √9+√8,we get

=1/√9-√8 ×√9+√8/√9+√8

=√9+√8/(√9)^2-(√8)^2. [we used identity

a^2-b^2=(a+b)(a-b) ]

=√9+√8/9-8

=√9+√8/1

=√9+√8