Algebra-1

To find the vertex of the quadratic function f(x) = x² + 10x + 21, we can use the vertex formula. In this case, the quadratic function is in the form f(x) = ax² + bx + c, with a = 1, b = 10, and c = 21.

The x-coordinate of the vertex is given by x = -b / (2a). Plugging in the values, we get:

x = -10 / (2 * 1)
  = -10 / 2
  = -5

So, the x-coordinate of the vertex is x ...