Question 29
The square root of a number plus $$2$$ gives the number itself. Then the number is
Correct Answer: 4
Solution
Let the number be $$N$$ and put $$y=\sqrt{N}$$. Then $$y+2=y^2$$, so $$(y-2)(y+1)=0$$. Since $$y$$ is non-negative, $$y=2$$ and hence $$N=4$$.
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