Question

The vertex of this parabola is at (2, -4). When the x-value is 3, the yvalue is -1. What is the coefficient of the squared expression in the parabola's equation?

Answer 1

3

Explanation:

Fill in the known values in the vertex form equation and solve for the coefficient.

y = a(x -h)^2 +k

-1 = a(3 -2)^2 -4 = a -4 . . . . fill in the values and simplify

3 = a . . . . . . . . . . . . . . . . . . .add 4

The coefficient of the squared expression is 3.