Graph f(x)=-1/3 square root of x

$f (x) = - \frac{1}{3} \sqrt{x}$

Step 1

Find the domain for $y = - \frac{1}{3} \cdot \sqrt{x}$ so that a list of $x$ values can be picked to find a list of points, which will help graphing the radical.

Set the radicand in $\sqrt{x}$ greater than or equal to $0$ to find where the expression is defined.

$x \geq 0$

The domain is all values of $x$ that make the expression defined.

Interval Notation:

$[0, \infty)$

Set-Builder Notation:

${x | x \geq 0}$

Interval Notation:

$[0, \infty)$

Set-Builder Notation:

${x | x \geq 0}$

Step 2

To find the radical expression end point, substitute the $x$ value $0$ , which is the least value in the domain, into $f (x) = - \frac{\sqrt{x}}{3}$ .

Replace the variable $x$ with $0$ in the expression.

$f (0) = - \frac{\sqrt{0}}{3}$

Simplify the result.

Simplify the numerator.

Rewrite $0$ as $0^{2}$ .

$f (0) = - \frac{\sqrt{0^{2}}}{3}$

Pull terms out from under the radical, assuming positive real numbers.

$f (0) = - \frac{0}{3}$

Simplify the expression.

Divide $0$ by $3$ .

$f (0) = - 0$

Multiply $- 1$ by $0$ .

$f (0) = 0$

The final answer is $0$ .

$0$

Step 3

The radical expression end point is $(0, 0)$ .

$(0, 0)$

Step 4

Select a few $x$ values from the domain. It would be more useful to select the values so that they are next to the $x$ value of the radical expression end point.

Substitute the $x$ value $1$ into $f (x) = - \frac{\sqrt{x}}{3}$ . In this case, the point is $(1, - \frac{1}{3})$ .

Replace the variable $x$ with $1$ in the expression.

$f (1) = - \frac{\sqrt{1}}{3}$

Simplify the result.

Any root of $1$ is $1$ .

$f (1) = - \frac{1}{3}$

The final answer is $- \frac{1}{3}$ .

$y = - \frac{1}{3}$

Substitute the $x$ value $2$ into $f (x) = - \frac{\sqrt{x}}{3}$ . In this case, the point is $(2, - \frac{\sqrt{2}}{3})$ .

Replace the variable $x$ with $2$ in the expression.

$f (2) = - \frac{\sqrt{2}}{3}$

The final answer is $- \frac{\sqrt{2}}{3}$ .

$y = - \frac{\sqrt{2}}{3}$

The square root can be graphed using the points around the vertex $(0, 0), (1, - 0.33), (2, - 0.47)$

$\begin{array}{c} x & y \\ 0 & 0 \\ 1 & - 0.33 \\ 2 & - 0.47 \end{array}$

Step 5

Graph f(x)=-1/3 square root of x

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