Home > INT3 > Chapter 9 > Lesson 9.2.3 > Problem9-128

9-128.

Carmel picks an integer from $1$ to $12$ as a value for $c$ in the equation $y = x^{2} + 4x + c$. What is the probability that his equation will have complex roots?

If $b^2−4ac<0$ then the equation will have complex roots.

$\frac{2}{3}$