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Mathematica competitions in Croatia

Croatia algebra

Problem

Determine all values of the real parameter for which the equation has no real solutions.
Solution
Let us consider the quadratic equation: This equation has no real solutions if and only if its discriminant is negative.

The discriminant is: We require: Divide both sides by : But the quadratic has discriminant: So is always positive for all real .

Therefore, there is no real value of for which the equation has no real solutions.
Final answer
no real values of m

Techniques

Quadratic functionsLinear and quadratic inequalities