Pre-Algebra Examples

Graph f(x) = square root of 11-x
Step 1
Find the domain for so that a list of values can be picked to find a list of points, which will help graphing the radical.
Tap for more steps...
Step 1.1
Set the radicand in greater than or equal to to find where the expression is defined.
Step 1.2
Solve for .
Tap for more steps...
Step 1.2.1
Subtract from both sides of the inequality.
Step 1.2.2
Divide each term in by and simplify.
Tap for more steps...
Step 1.2.2.1
Divide each term in by . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.
Step 1.2.2.2
Simplify the left side.
Tap for more steps...
Step 1.2.2.2.1
Dividing two negative values results in a positive value.
Step 1.2.2.2.2
Divide by .
Step 1.2.2.3
Simplify the right side.
Tap for more steps...
Step 1.2.2.3.1
Divide by .
Step 1.3
The domain is all values of that make the expression defined.
Interval Notation:
Set-Builder Notation:
Interval Notation:
Set-Builder Notation:
Step 2
To find the radical expression end point, substitute the value , which is the least value in the domain, into .
Tap for more steps...
Step 2.1
Replace the variable with in the expression.
Step 2.2
Simplify the result.
Tap for more steps...
Step 2.2.1
Multiply by .
Step 2.2.2
Subtract from .
Step 2.2.3
Rewrite as .
Step 2.2.4
Pull terms out from under the radical, assuming positive real numbers.
Step 2.2.5
The final answer is .
Step 3
The radical expression end point is .
Step 4
Select a few values from the domain. It would be more useful to select the values so that they are next to the value of the radical expression end point.
Tap for more steps...
Step 4.1
Substitute the value into . In this case, the point is .
Tap for more steps...
Step 4.1.1
Replace the variable with in the expression.
Step 4.1.2
Simplify the result.
Tap for more steps...
Step 4.1.2.1
Multiply by .
Step 4.1.2.2
Subtract from .
Step 4.1.2.3
The final answer is .
Step 4.2
Substitute the value into . In this case, the point is .
Tap for more steps...
Step 4.2.1
Replace the variable with in the expression.
Step 4.2.2
Simplify the result.
Tap for more steps...
Step 4.2.2.1
Multiply by .
Step 4.2.2.2
Subtract from .
Step 4.2.2.3
Any root of is .
Step 4.2.2.4
The final answer is .
Step 4.3
The square root can be graphed using the points around the vertex
Step 5