Algebra-1

To find the vertex of the quadratic function f(x) = -x² - 4x + 12, you can use the formula x = -b / (2a), where a and b are the coefficients of the quadratic term and the linear term, respectively.

In this case, a = -1 and b = -4.

Plugging these values into the formula, we have x = -(-4) / (2 * -1) = 4 / -2...