Question

Which explanation correctly analyzes the difference between an irrational number and a rational number?

1. The expression 25−−√−21−−√ can be rewritten as 25−21−−−−−−√ or 4–√. Since 4–√=2, the difference is rational.

2. The expression 25−−√−21−−√ can be rewritten as 5−21−−√. Since the exact value of 21−−√ cannot be found, the difference is irrational.

3. The expression 25−−√−21−−√ can be rewritten as −521−−√. Since the exact value of 21−−√ cannot be found, the difference is irrational.

4. The expression 25−−√−21−−√ can be rewritten as 5−21−−√. Since the value of 21−−√≈4.59, the difference is rational.

Answer 1

Answer:

I guess the answer should be 2.

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Answer 2

Answer: That would be 2