No. 5 is not an irrational number.
5 is an integer (whole number) and all integers are rational - that is, they can be expressed as a ratio. In this case, 5/1.
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phi = [1+sqrt(5)]/2 sqrt(5) is irrational and so phi is irrational.
5 squared is 5*5 is 25. 25 is not an irrational number.
No, -5 is not an irrational number. Irrational numbers are numbers that cannot be represented as the quotient of two integers. Since -5 is already an integer, it is rational.
Yes, √3 + √5 is irrational.
no