Question

y=-\frac(1)(12)x^2 + 4 x + 3 find the max height of the ball

Answer 1

This is the equation of a parabola that opens downward. Find the vertex of the parabola. The y-coordinate of the vertex will be the maximum height.
The x-coordinate of the parabola ax^2 + bx + c is given by -b/(2a). Use this to find the x-coordinate of the vertex. Plug it into the equation and find the y-coordinate of the vertex.