Prove that
3√3/5 is irrational.
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Nikhil8681:
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Let √3 + √5 be a rational number , say r
then √3 + √5 = r
On squaring both sides,
(√3 + √5)2 = r2
3 + 2 √15 + 5 = r2
8 + 2 √15 = r2
2 √15 = r2 - 8
√15 = (r2 - 8) / 2
Now (r2 - 8) / 2 is a rational number and √15 is an irrational number .
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