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Using quadratic function concepts, it is found that Abby made a mistake on the coordinates of the vertex, which are (-4,1).
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- A quadratic function is defined by:
- The y-intercept is given by point:
- The vertex is given by:
.
- The axis of symmetry is:
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The function given is:
- Which is a quadratic equation with:
.
, thus, the y-intercept is (0, -15).
- Thus, the <u>x-coordinate of the vertex</u> is x = -4, which is the same as the <u>axis of symmetry</u>.
- The vertex is given by: (-4,1).
A similar problem is given at brainly.com/question/14680175