- #1
Saitama
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Homework Statement
[tex]3\sqrt{x}-\sqrt{x+3}>1[/tex]
Homework Equations
The Attempt at a Solution
As obvious from the given inequality, x must be greater than zero.
Rearranging and squaring both the sides,
[tex]9x>1+x+3+2\sqrt{x+3} \Rightarrow 4x-2>\sqrt{x+3}[/tex]
Squaring again,
[tex]16x^2+4-16x>x+3 \Rightarrow 16x^2-17x+1>0 \Rightarrow (x-1/16)(x-1)>0[/tex]
Hence, ##x \in (0,1/16) \cup (1,\infty)## but this is wrong. The correct answer is ##(1,\infty)##. I don't see what I did wrong.
Any help is appreciated. Thanks!