Question

which of the following is not an irrational number?
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Answer 1

Step-by-step explanation:

(2+root 5)(2-root5) is not an irrational number.

Answer 2

Step-by-step explanation:

1) 5+√5 is an Irrational number

Because the sum of a rational and irrational number is an Irrational number

2)(2+√5)√5=2√5+5 is an irrational number.

Because the sum of a rational number and an irrational number is an Irrational number.

3)(2+√5)(2-√5)=2²-(√5)²=4-5=

-1 is a rational number.

4)5√5 is an irrational number

5√5 is an irrational numberBecause The product of a rational and irrational number is an irrational number.