Algebra-2

Since one of the x-intercepts is at (7, 0), we know that either x - m = 0 when x = 7 or x - n = 0 when x = 7.

So, either m = 7 or n = 7.

Now, the x-coordinate of the vertex of a parabola given in factored form is the average of the two roots (i.e., the x-intercepts).