Algebra-2

The vertex of a parabola can be found using the axis of symmetry and substituting it back into the function.

First, find the axis of symmetry by calculating the midpoint of the x-intercepts.

For y = (x + 3)(x − 5), the x-intercepts are −3 and 5, so the axis of symmetry is:



Next, substitute x = 1 into the original equation to find the y-coordinate of the vertex:

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