Question

What is the equation in vertex form of a

parabola with vertex (2, 4) that opens
downward and is stretched by a factor of
3?

Answer 1

B.

Explanation:

Vertex with (2,4) means that the equation will have:

y=a(x-2)^2 + 4

Open downwards means that the a will be negative:

so: y = -a (x-2)^2 + 4

Stretched by a factor of 3 means that the a=3

So if we combine all of these, we will get the equation:

y = -3 (x-2)^2 + 4