Spivak's Calculus: Chapter 1, Problem 18b (Quadratic determinant less than zero) – math.stackexchange.com

Spivak's Calculus: Chapter 1, Problem 18b (Quadratic determinant less than zero) – math.stackexchange.com

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The problem in question is as follows: 18b Suppose that $b^2 -4c \lt 0$. Show that there are no numbers $x$ that satisfy $x^2 + bx + c = 0$; in fact, $x^2 + bx + c \gt 0$ for all $x$. Hint: complete ...

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