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MathNet 2018-part-05 — 181 problems (EN–VI) Question 148

Math Olympiad Vault · MathNet 2018-part-05 — 181 problems (EN–VI)

Question 148

We are given the quadratic function $f$ defined by $f(x) = (m-1)x^{2} + m x + m$, where $m \neq 1$.

a. For $m=3$ compute the minimum value of the function $f$.

b. Find all real numbers $m$ for which the function $f$ is strictly negative for every $x$.