Question

Determine the direction that this parabola opens y=x^2+2x+8

up or down

Answer 1

up

Explanation:

The standard equation for a parabola is y = ax^2 + bx + c. If the coefficient a is positive, then the curve (graph) opens up.

In y=x^2+2x+8 this coefficient is +1, so the curve opens up.