show that 2 + root 5 is an irrational number
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Sum of rational and irrational number is always irrational.
In 2+ root 5, 2 is rational and root 5 is irrational, so 2+ root 5 is irrational
In 2+ root 5, 2 is rational and root 5 is irrational, so 2+ root 5 is irrational
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