# F.P Math > Surds

- √a x √b = √ab
- √a / √b =√
- √a / √b and √a - √b are conjugate surds. The product of conjugate surds is a rational number.

- √a x √b = √ab
- √a / √b =√
- √a / √b and √a - √b are conjugate surds. The product of conjugate surds is a rational number.