# If we know the vertex of a parabola is (-2,-5), can we figure out the equation of the parabola?

##### 1 Answer

Apr 19, 2015

No, because three data are necessary. If the vertex is known you can write:

where

E.G.:

graph{y+5=(x+2)^2 [-10, 10, -5, 5]}

graph{y+5=3(x+2)^2 [-10, 10, -5, 5]}

graph{y+5=1/2(x+2)^2 [-10, 10, -5, 5]}

graph{y+5=-2(x+2)^2 [-10, 10, -15, 15]}