What are the solutions to the quadratic equation x² + 2x - 15 = 0?

Explanation

To solve x² + 2x - 15 = 0, factor the equation as follows: x² + 5x - 3x - 15 = 0, which groups into x(x + 5) - 3(x + 5) = 0. This factors further to (x - 3)(x + 5) = 0, giving the roots x = 3 or x = -5.