Find the Range f(x)=3x^2+6x-9

$f (x) = 3 x^{2} + 6 x - 9$

Step 1

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

Interval Notation:

$[- 12, \infty)$

Set-Builder Notation:

${y | y \geq - 12}$

Step 2