9. Prove that (+3 + v7) is irrational.
[Hint. If possible, let (V3+ V7) be rational.
Then, (+3 + V7) is rational
But, (13 + 17)* = (3 + 7 + 2/21) = (10 + 2/21), which is clearly irrational.
So, our supposition is wrong.]
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