Prove that 2 - 3√5 is irrational, given that √3 is irrational.
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let us assume tht 2-3√5 is rational
we can find some integer like a&b
such tht 2-3√5 =a/b
-3√5 =a-2/b
√5= a-2/3b
√5 is irrational so our assumptions is wrong that 2-3√5 is also irrational
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