Question

The vertex of this parabola is at (5, -4). Which of the following could be its equation.

Answer 1

B

Explanation:

Since the y coordinate of the vertex is -4, it has to be the rest of the equation subtracted by 4, which eliminates A and C.

Adding 5 puts it on the left side, so you have to subtract 5.

Then you add all the default info and the info we found out.

y = 2(x-5)^2-4

So technically by process of elimination, B must be the answer.