Quadratic graphs

I need to calculate an equation
ax^2 + bx + c
but all im given are datas such as the vertex and intercepts.
can it be done, or do i need more infos?

>>1
use x-intercepts to get binomial factors, set equal to y
put a k in front of the expression, y = k(factor#1)(factor#2)
substitute any other point into your equation, putting its values in for x and y, solve for k
re-express equation as y = function of x.