SOLUTION: Find k such that the equation x^2 - kx + 4 = 0 has a repeated real solution.

SOLUTION: Find k such that the equation x^2 - kx + 4 = 0 has a repeated real solution.

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Question 1208779:
Find k such that the equation x^2 - kx + 4 = 0 has a repeated real solution.

Answer by Shin123(626) (Show Source): You can put this solution on YOUR website!
Note that a quadratic has a repeated root if and only if the discriminant of it is 0. The discriminant of this quadratic is . Therefore, we must have , so or . We can check that both of these indeed work, , and .
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