Which expression could represent a rational number?

Let a represent a non-zero rational number and let b represent an irrational number 
Which expression could represent a rational number?

-b
a + b
ab
b² 

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It somewhat depends on what the irrational number is.

If it is something simple such as √3,
then the expression that would represent a rational number would be:

b², because
(√3)² would be 3…..which is a rational number.

All the other choices would still remain irrational numbers.

Best Answer:  b² 

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