Question

The conjugate of 4 - 5$\sqrt{5}$ is _________________

• A. True
• B. False
• C. $\sqrt{5}$
• D. 5$\sqrt{5}$

Answer 1

The correct option is A

True

The conjugate of any irrational number is its rationalising factor.

So the conjugate of 4 - 5$\sqrt{5}$ is 4 + 5$\sqrt{5}$