Given √2 is irrational prove that 3-5√2 is irrational
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let us assume that 3-5√2 is rational
then, 3-5√2 = a/b (where a and b are co-primes and b ≠ 0)
-5√2 = a/b - 3
-5√2 = (a-3b)/b
√2 = (a-3b)/-5b
but √2 is irrational (given)
hence, if LHS i.e √2 is irrational , RHS is also irrational
so, our assumption is wrong
3-5√2 is IRRATIONAL
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