How to draw a graph of a quadratic equation

How to draw a graph of a quadratic equation.

1.     1. We must know the quadratic equation. y=x²+bx+c

2.     2. Find intersection point in y axis. When x=0  then y= a(0)²+b(0)+c and we get point (0,C)

3.      3. The intersection point in x axis. When y=0 then 0=x²+bx+c  and we get two point  (X₁,0) and (x₂,0)

4.     4.Using the equation of axis symmetry is the line  X= -b/2a

5.  5. Find the vertex of coordinate using the formula are (x,y) is equal to  (-b/2a, -D/4a). D = b²-4ac

6.     6.The last we draw the graph based on the point we found.  Example we found the point are (0,-8), (-2,0) and (4,0), 1, -9)

Regard
Septy Cartika Sari
2010110036