Find the Range f(x)=4x-x^2-13

$f (x) = 4 x - x^{2} - 13$

Step 1

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

Interval Notation:

$(- \infty, - 9]$

Set-Builder Notation:

${y | y \leq - 9}$

Step 2