Let the number be 'x'.
So, x - 42 = √x
On, squaring both sides, we have;
(x - 42) 2 = (√x) 2
Or, x2 + 1764 - 84x = x
Or, x2 - 85x + 1764 = 0
Or, x2 - 36x - 49x + 1764 = 0
Or, x(x - 36) - 49(x - 36) = 0
Or, (x - 49) (x - 36) = 0
So, x = 49 or x = 36
We can see that 'x' = 36 will not satisfy the equation, so x = 49
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