Question

Please help me with this problem

Answer 1

The given graph represents a quadratic function with negative leading coefficient, hence it opens down.

c) Its vertex is its maximum and the function is increasing before reaching vertex and decreasing after it.

The vertex is at (-2, 8) so the domain on which the function is increasing is:

• x < - 2

d) The x-intercepts of the graph are x = - 6 and x = 2. The function is positive between the x-intercepts and negative outside, so:

• f(x) < 0 when x < - 6 and x > 2