Graph y = square root of x-8

$y = \sqrt{x - 8}$

Step 1

Find the domain for $y = \sqrt{x - 8}$ 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 $\sqrt{x - 8}$ greater than or equal to $0$ to find where the expression is defined.

$x - 8 \geq 0$

Add $8$ to both sides of the inequality.

$x \geq 8$

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

Interval Notation:

$[8, \infty)$

Set-Builder Notation:

${x | x \geq 8}$

Interval Notation:

$[8, \infty)$

Set-Builder Notation:

${x | x \geq 8}$

Step 2

To find the radical expression end point, substitute the $x$ value $8$ , which is the least value in the domain, into $f (x) = \sqrt{x - 8}$ .

Replace the variable $x$ with $8$ in the expression.

$f (8) = \sqrt{(8) - 8}$

Simplify the result.

Subtract $8$ from $8$ .

$f (8) = \sqrt{0}$

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

$f (8) = \sqrt{0^{2}}$

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

$f (8) = 0$

The final answer is $0$ .

$0$

Step 3

The radical expression end point is $(8, 0)$ .

$(8, 0)$

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 $9$ into $f (x) = \sqrt{x - 8}$ . In this case, the point is $(9, 1)$ .

Replace the variable $x$ with $9$ in the expression.

$f (9) = \sqrt{(9) - 8}$

Simplify the result.

Subtract $8$ from $9$ .

$f (9) = \sqrt{1}$

Any root of $1$ is $1$ .

$f (9) = 1$

The final answer is $1$ .

$y = 1$

Substitute the $x$ value $10$ into $f (x) = \sqrt{x - 8}$ . In this case, the point is $(10, \sqrt{2})$ .

Replace the variable $x$ with $10$ in the expression.

$f (10) = \sqrt{(10) - 8}$

Simplify the result.

Subtract $8$ from $10$ .

$f (10) = \sqrt{2}$

The final answer is $\sqrt{2}$ .

$y = \sqrt{2}$

The square root can be graphed using the points around the vertex $(8, 0), (9, 1), (10, 1.41)$

$\begin{array}{c} x & y \\ 8 & 0 \\ 9 & 1 \\ 10 & 1.41 \end{array}$

Step 5

Graph y = square root of x-8

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