Question

Guided Practice

Write the equation of the parabola in vertex form. The vertex is (−4, −3) and the parabola passes through the point (−1, −48). Create a rough sketch of the graph to use as a visual aid.


A.
y = −16(x + 3)^2 + 4


B.
y = −5(x + 4)^2 − 3


C.
y = −(x − 4)^2 − 3


D.
y = −5(x − 4)^2 − 3

Answer 1

B.

y = −5(x + 4)^2 − 3

Explanation:

Use the vertex and another point on the parabola to find the value of a. Then substitute the vertex (−4, −3) and a into the vertex form, y = a(x − h)2 + k.