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MathNet 2007-part-01 — 187 problems (EN–VI) Question 99

Math Olympiad Vault · MathNet 2007-part-01 — 187 problems (EN–VI)

Question 99

The functions $f(x) = 2x^2 + 2x - 4$ and $g(x) = x^2 - x + 2$ are given. Find all real values of $x$ such that:

a) $\frac{f(x)}{g(x)}$ is a positive integer;

b) the inequality $\sqrt{f(x)} + \sqrt{g(x)} \ge \sqrt{2}$ holds.