Algebra Examples

Find the Function f(x)=|x|
Step 1
The function can be found by evaluating the indefinite integral of the derivative .
Step 2
Set the argument in the absolute value equal to to find the potential values to split the solution at.
Step 3
Simplify the answer.
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Step 3.1
Create intervals around the solutions to find where is positive and negative.
Step 3.2
Substitute a value from each interval into to figure out where the expression is positive or negative.
Step 3.3
Integrate the argument of the absolute value.
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Step 3.3.1
Set up the integral with the argument of the absolute value.
Step 3.3.2
By the Power Rule, the integral of with respect to is .
Step 3.4
On the intervals where the argument is negative, multiply the solution of the integral by .
Step 3.5
Combine and .
Step 3.6
Simplify.
Step 3.7
Simplify.
Step 4
The function if derived from the integral of the derivative of the function. This is valid by the fundamental theorem of calculus.