Q38. - Algebra 2

Question

Graph each function. Identify the domain and range.

$f\left(x\right)=\{\begin{array}{l}-xifx\le 3\\ 2ifx>3\end{array}$

Step-by-Step Solution

Answer

The domain of the function is all real numbers and range is $\left\{y\right|y\ge -3\}$.

The graph of the function is shown below:

Step-1 – Domain and range of the function.

The domain of the function is the set of all input values and range of the function is the set of all output values.

Step-2 – Draw the graph.

The given function is $f\left(x\right)=\{\begin{array}{l}-xifx\le 3\\ 2ifx>3\end{array}$

The graph of the equation $f\left(x\right)=-x$  is linear equation for $x\le 3$.

Here, 3 satisfies the inequality $x\le 3$. Therefore, stop with closed circle at $x=3$.

Put various values of x and obtained the respective y values.

The required table is:

The graph of the equation $f\left(x\right)=2$  is constant function for $x>3$.

Here, 3 does not satisfies the inequality $x>3$. Therefore, start with open circle at $x=3$.

The graph of the function is shown below:

Step-3 – Determine the domain and range.

Here, it can be observed that the domain of the function is the set of all real values because the function can take any value of x.

Also, the range is $\left\{y\right|y\ge -3\}$.