When does the image of quadratic function pass through the origin?
1. In the general form of quadratic function ax & # 178; + BX + C (a ≠ 0), C can shift the function image up and down,
When the symmetry axis (- B / 2a) is 0 and C = 0, the function image passes through the origin
2. In the form of a (X-H) ² + K, when the vertex (h, K) = (0,0), the function image passes through the origin