Question

a parabola opens down if the alue of ____ is negative in eneral form of the equ

Answer 1

If a value of "a" is negative then the parabola opens down, if it is a vertical parabola, and if it a horizontal parabola, then it opens to the left.

If a value of "a" is positive then the parabola opens up, if it is a vertical parabola, and if it a horizontal parabola, then it opens to the right.

Answer 2

\(\large\color{black}{ y=a(x-h)^2+k }\) vertical parabola.

\(\large\color{black}{ x=a(y-k)^2+h }\) horizontal parabola.