Find the Range f(x)=2x^2-8x-9

$f (x) = 2 x^{2} - 8 x - 9$

Step 1

The range is the set of all valid $y$ values. Use the graph to find the range.

Interval Notation:

$[- 17, \infty)$

Set-Builder Notation:

${y | y \geq - 17}$

Step 2