completing the square	the process of changing a polynomial of the form into a perfect square trinomial , or
discriminant	the expression b² – 4ac under the radical in the quadratic formula; the expression can be used to determine the number of real roots the quadratic equation has
quadratic formula	the formula ; it is used to solve a quadratic equation of the form
roots of a quadratic equation	the x-intercepts of the parabola or the solution of the equation
x-intercept	the point where a line meets or crosses the x-axis