Question

prove that 2-√5 is an irrational number
​

Answer 1

Answer:

mark as brainiest

Step-by-step explanation:

2-√5 irrational because √5 is irrational. The only way you can add or subtract a number to √5 to make the result rational, is by keeping the number irrational. For example, you can add the result of 2-√5 to √5 (2-√5 +√5) to produce a rational result, 2.