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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.
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