Which of the following equations is of a parabola with a vertex at (0, 3)?y = (x - 3)2y = (x + 3)2y = x2 - 3y = x2 + 3

Vertex form is  a(x - b)^2 + c       where the vertex is at (b, c)

here b  = 0 and c = 3   and a = 1 

so answer is D:-    y = x^2 + 3