Question

A. f(x) = -x^2 - x - 4

B. f(x) = -x^2 + 4

C. f(x) = x^2 + 3x + 4

D. f(x) = x^2 + 4

Answer 1

B: -x^2 + 4

Explanation:

If the equation was
`f(x)=x^2`, then the vertex would be at 0, and the "U" would be facing straight up. Here, the "U" is upside down, so that means the "x^2" would have to be a negative number (
`-x^2`) to get the upside-down "U". Then, we could see that the vertex is at positive 4, so that means that the parabola moved up 4 units, so the equation should end in +4.

Our answer is:

B: -x^2 + 4