If the y-coordinate of the vertex of the graph of y = ax 2 + bx + c, a < 0 is zero, then the zero of the quadratic polynomial is equal to ?

If the y-coordinate of the vertex of the graph of y = ax 2 + bx + c, a

1.	If the y-coordinate of the vertex of the graph of y = ax 2 + bx + c, a < 0 is zero, then the zero of the quadratic polynomial is equal to ?
Answer» If the y-coordinate of the vertex of the graph of y = ax 2 + bx + c, a < 0 is zero, then the zero of the quadratic polynomial is equal to ?