7.5.5 Quadratic Equations

This subsection is not completed yet, but in the meantime here are some practice questions.

The solutions of the equation \[ax^2 + bx + c = 0\] are given by the quadratic formula: \[x = \frac{-b \pm \sqrt\Delta}{2a}\] where $\Delta$ is the ‘discriminant’: \[\Delta = b^2 - 4ac.\] If $\Delta \gt 0$, there are two solutions; if $\Delta = 0$, there is one solution; if $\Delta \lt 0$, there are no real solutions.

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