CPM Homework Help : A2C Problem 4-108

Find the $x$ - and $y$ -intercepts and the vertex of $y = x^{2} + 2x − 80$ , sketch the graph, and write the equation in graphing form.

Hint:

Find the $x$ -intercepts and use them to locate the vertex.

Answer:

$y = \left(x + 1\right)^{2} − 81$