Find the Range f(x)=-8x^2-24x+9

$f (x) = - 8 x^{2} - 24 x + 9$

Step 1

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

Interval Notation:

$(- \infty, 27]$

Set-Builder Notation:

${y | y \leq 27}$

Step 2