Question

draw graph for a=0??​

Answer 1

your question ⚓

draw graph for a=0??

your answer ⚓

If a<0 , the graph makes a frown (opens down) and if a>0 then the graph makes a smile (opens up). The extreme point ( maximum or minimum ) of a parabola is called the vertex, and the axis of symmetry is a vertical line that passes through the vertex.