Additional Information: The curve of y=(4-x)(x+5) cuts the x-axis at A and B. A straight line cuts the curve at A and at C. The x-coordinate of C is 2. Find

(a) the coordinates of point C,

(b) the equation of line AC,

(c) the area of Triangle ABC

I am stuck at the (a) part. I can't find a solution to get the "y" of point C. I don't see any clue too. What should I do to get "y" of point C?