Chapter 4 Quadratic Functions and Factoring - 4.10 Write Quadratic Functions and Models - 4.10 Exercises - Quiz for Lessons 4.8-4.10 - Page 315: 11

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We already know $y$, $x$, $k$ and $h$ from the given vertex and point, so in order to get the quadratic function we need to find $a$. $y=a(x-h)(x-k)$ $-40=a(7+3)(7-5)$ $-40=20a$ $a=-2$ Therefore the function is: $y=-2(x+3)(x-5)$