Solve Inequality: 4x^2/(1-√(1+2x))^2 < 2x+9

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SUMMARY

The inequality \(\frac{4x^2}{(1-\sqrt{1+2x})^2}<2x+9\) can be solved by first recognizing that the denominator is always positive, allowing for multiplication without altering the inequality sign. By expanding the equation and isolating the square root, the problem reduces to solving a polynomial of degree 4. This approach leads to identifying the critical points and determining the intervals where the inequality holds true.

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Homework Statement



For what values of the variable x does the following inequality hold:

\frac{4x^2}{(1-\sqrt{1+2x})^2}&lt;2x+9

Homework Equations


The Attempt at a Solution



Maybe some hints for me to begin.
 
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The denominator is all squared so it must be positive (can't be zero). Therefore you can multiply through without worrying about changing the inequality sign and after that, expand, and leave the surd alone on one side, square the equation and you will get now have a polynomial of degree 4.
 

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