Find the Range f(x)=-4x^2-20x+9

$f (x) = - 4 x^{2} - 20 x + 9$

Step 1

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

Interval Notation:

$(- \infty, 34]$

Set-Builder Notation:

${y | y \leq 34}$

Step 2