Algebra-1

First, factor the quadratic trinomial -x² - 4x + 16.

We can rewrite it as -(x² + 4x - 16).

Now factor x² + 4x - 16. We need to find two numbers that multiply to -16 and add up to 4.

The factors of 16 are: 1, 2, 4, 8 and 16.

We need to find two numbers whose sum is 4. The numbers are -2 and 8 be...