Prove that 4+2√5is irrational
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Since a, b are integers, then (a − 4b)/(−5b) represents a rational number. Hence our assumption that " 4−5√2 = (a/b) is a rational number" is incorrect. We know that RHS of this is Rational,but LHS is irrational. 4-5✓2 is irrational
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