The quadratic function below represents a parabola that opens down. which value could be the missing number in the equation ? the missing coefficient could be ?

-4

Step-by-step explanation:

The direction of the parabola depends on the sign of the leading coefficient i.e. sign of the coefficient with the squared term.

Remember these two points for vertical parabola:

We are given that the parabola opens down. This means that the leading coefficient must be negative. Among the given options only one option contains a negative number i.e. -4.

Therefore, the missing coefficient could be -4