Answer :
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)
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)