Solve the inequality: \(|x - 2| > 3|2x + 1|\)
Solution
To solve the inequality \(|x - 2| > 3|2x + 1|\), we first consider the non-modular inequality:
\((x - 2)^2 > (3(2x + 1))^2\)
This simplifies to:
\((x - 2)^2 > 9(2x + 1)^2\)
Expanding both sides, we get:
\(x^2 - 4x + 4 > 36x^2 + 72x + 36\)
Rearranging terms gives:
\(x^2 - 4x + 4 - 36x^2 - 72x - 36 > 0\)
\(-35x^2 - 76x - 32 > 0\)
Solving the quadratic equation \(-35x^2 - 76x - 32 = 0\) gives critical values \(x = -1\) and \(x = -\frac{1}{7}\).
Testing intervals, we find the solution to the inequality is:
\(-1 < x < -\frac{1}{7}\)
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