Question

{ √8 - √9 } What is the conjugate?

Answer 1

The conjugate of (√a + √b) is (√a - √b)
And the conjugate of (√a - √b)  is  (√a + √b)
In short you noticed that we just change the sign to find the conjugate;

So the conjugate of (√8 - √9) = (√8 + √9)