Algebra-1

To find the vertex of the quadratic function y = -x² + 4, we can again use the vertex formula. In this case, the quadratic function is in the form y = ax² + bx + c, with a = -1, b = 0, and c = 4.

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

x = -0 / (2 * -1)
  = 0 / -2
  = 0