An easy to use calculator to find the vertex, x and y intercepts of the graph of a quadratic function of the form
f(x) = ax2 + bx + c
This online calculator uses the formula h = -b / 2a to find the x coordinate h of the vertex of a parabola and k = f(h) to find the y coordinate k of the vertex. To find the x intercepts, it solves the quadratic equation ax2 + bx + c = 0. The y intercept if given by f(0).
How to use the calculator
1 - Enter the coefficients a, b, c and the number of decimal places as real number and press "enter". The x coordinates of the x intercepts are displayed. If the two coordinates are equal, the graph touches the x axis and the two x intercepts have equal x coordinates. The x intercepts may not exist. The y coordinate of the y intercept is also displayed. The x and y coordinates of the vertex are also displayed at the bottom.