Write A Quadratic Function In Vertex Form Worksheet With Answers - James Madison High School Page 7
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12Write a quadratic function in vertex form
Write a quadratic function for the parabola shown.
SOLUTION
Use vertex form because the
vertex is given.
y – k = a(x – h)
2
Vertex form
y = a(x – 1)
– 2
2
Substitute 1 for h and –2 for k.
Use the other given point, (3, 2), to find a.
– 1)
– 2
2
2
=
a(3
Substitute 3 for x and 2 for y.
2 = 4a – 2
Simplify coefficient of a.
1 = a
Solve for a.
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