1, $\sqrt{x^2+5}=x+1+\sqrt{x^2+3x+4}$
2, $\sqrt{x^2+5x+4}=\sqrt{x^2+3x}+2x$
3, $\sqrt{5x^2+2x}-\sqrt{5x^2+x+4}=x+4$
1, $\sqrt{x^2+5}=x+1+\sqrt{x^2+3x+4}$
2, $\sqrt{x^2+5x+4}=\sqrt{x^2+3x}+2x$
3, $\sqrt{5x^2+2x}-\sqrt{5x^2+x+4}=x+4$
Don't care
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