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

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

Step 1

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Interval Notation:

$(- \infty, \infty)$

Set-Builder Notation:

${x | x \in ℝ}$

Step 2

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 3

Determine the domain and range.

Domain: $(- \infty, \infty), {x | x \in ℝ}$

Range: $[- 12, \infty), {y | y \geq - 12}$

Step 4

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

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