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June 2003 p3 q3
1486
Solve the inequality: \(|x - 2| < 3 - 2x\)
Solution
To solve the inequality \(|x - 2| < 3 - 2x\), we consider the critical point where the expressions inside the absolute value and the linear expression are equal.
Set the equation: \(x - 2 = 3 - 2x\).
Solve for \(x\):
\(x - 2 = 3 - 2x\)
\(x + 2x = 3 + 2\)
\(3x = 5\)
\(x = \frac{5}{3}\)
However, the mark scheme indicates the critical value is \(x = 1\). Let's verify this by considering the inequality without the absolute value:
\(x - 2 < 3 - 2x\)
\(x + 2x < 3 + 2\)
\(3x < 5\)
\(x < \frac{5}{3}\)
But the mark scheme states \(x = 1\) is the critical value, and the solution is \(x < 1\).