The graph of a certain quadratic y = ax^2 + bx + c is a parabola with vertex (-4,0) which passes through the point (7,1). What is the value of a?
+36916 Vertex (-4,0) form of parabola
y= a ( x- - 4)^2 + 0
y = a (x+4)^2 sub in the point 7,1
1 = a (7+4)^2
so a = 1/121
