Algebra-1

First, factor the quadratic trinomial -x² - 4x + 12.

We can rewrite it as -(x² + 4x - 12).

Now factor x² + 4x - 12. We need to find two numbers that multiply to -12 and add up to 4.

The factors of 12 are: 1, 2, 3, 4, 6 and 12.

We need to find two numbers whose sum is 4. The numbers are -2 and 6 b...