SOLUTION: Find the quadratic function y​=f(x) whose graph has a vertex ​(-2​,​4) and passes through the point ​(-6​,0). Write the function in standard form.

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Find the quadratic function y​=f(x) whose graph has a vertex ​(-2​,​4) and passes through the point ​(-6​,0). Write the function in standard form.      Log On


   



Question 1176629: Find the quadratic function y​=f(x) whose graph has a vertex ​(-2​,​4) and passes through the point ​(-6​,0). Write the function in standard form.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
Using the vertex form of a parabola, y=a%28x-h%29%5E2+%2Bk where(h,k) is the vertex
Vertex (-2,4)
y = a(x+2)^2 + 4
P​(-6​,0)
0 = 16a+ 4
-4/16 = a = -.25
y+=+-.25%28x%2B2%29%5E2+%2B+4, the vertex form of a parabola
As to Standard form (If necessary):
y =-.25(x^2 + 4x + 4) + 1 =-.25x^2 - x - 1 + 4 = -.25x^2 - x + 3