Plot the function. y= (x+1)(x-3) by following these steps : plot the x-intercepts of the function

Step 1: Plot the x-intercepts of the function. (-1,0) and (3,0)

Step 2: Plot the point on the x-axis that is half way between the intercepts. (1,0)

Step 3: Plot the vertex on the dashed line. (1,-4)

Step 4: Plot the y-intercept. (0,-3)

Step 5: Use symmetry to plot another point where y= -3. (2,-3)

Step 6: The smooth curve through these points shows the graph of the function. --there is no answer for this step but the graph has points plotted from left to right are (-1,0), (0,-3), (1,-4), (2,-3), and (3,0)

answer:

a=9

step-by-step explanation: lmk if you need a explanation