Now that you have the equation, do you know how to find the roots of an equation? To make y = 0?
If x = 2, y = 0. This one is given for you, it's point c.
If x = ..., y = 0. This one you can solve yourself.
Solve the second root and that's the x-coordinates for b.
Oh, I see, so I'll take as , hence-
or
or
Now, since the value must be negative at the point ,
I should reject and take as the answer.
Also, the value at point must be .
Hence B is (-4,0).
Now I would have to do part (c).
The line of symmetry is the midpoint of the parabola.
What am I suppose to do now?