Solving Quadratic Equations: Factoring Answers

The product of two consecutive integers is 72. The equation x(x + 1) = 72 represents the situation, where x represents the smaller integer. Which equation can be factored and solved for the smaller integer?

–20–12✔ 1220

–20 or 3✔ –12 or –5 –3 or 205 or 12