exam Maths Puzzle Numerical Ability

what happens when we try to prove that sqrt4 is irrational?

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exam Other Question

How do I find all the values of w satisfying the equation?
6-5/w+2=-4/w-1 I am not understanding on how to find the equation on letter a of number 1 pg 9. I understand how to find the equation with two points, but i dont see 2 points unless i dont know w