A0 minimum smiling face a. X 2 a vx a v 0. 18 23 x 18 6 3 Thus the line of symmetry is x 3.
Example produces rational roots.
First the standard form of a quadratic equation is ax2 bx c 0 a 0 a x 2 b x c 0 a 0 The only requirement here is that we have an x2 x 2 in the equation. Use the reverse of factorisaton b Find the quadratic equation with roots 1 2 and 3 x 2 2x 1 2x 1 0 x 3 x 3 0 The equation is 2x 1x 3 0 2x2 7x 3 0 2. X 2 Sum of rootsx Product of roots 0. To find out the standard form of a quadratic equation when the roots are given.