Algebra-1

First, factor the quadratic trinomial -x² - 2x + 15.

We can rewrite it as -(x² + 2x - 15).

Now factor x² + 2x - 15. We need to find two numbers that multiply to -15 and add up to 2.

The factors of 15 are: 1, 3, 5 and 15.

We need to find two numbers whose sum is 2. The number...