Hello, I was looking at Riley's solution manual for this specific problem. Along the way, he ended up with a quadratic inequality:(adsbygoogle = window.adsbygoogle || []).push({});

View attachment how.bmp

If you looked at the image, he said it is given that λ is real, but he asserted that λ has no real roots because of the inequality. Doesn't that mean λ is imaginary or complex in some points then, contradicting his first statement? I reckon this has something to do with the properties of a quadratic inequality for complex variables.

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# Quadratic inequalities for complex variables?

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