Pre-Algebra Examples

Solve for x |2x+7|>27
Step 1
Write as a piecewise.
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Step 1.1
To find the interval for the first piece, find where the inside of the absolute value is non-negative.
Step 1.2
Solve the inequality.
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Step 1.2.1
Subtract from both sides of the inequality.
Step 1.2.2
Divide each term in by and simplify.
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Step 1.2.2.1
Divide each term in by .
Step 1.2.2.2
Simplify the left side.
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Step 1.2.2.2.1
Cancel the common factor of .
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Step 1.2.2.2.1.1
Cancel the common factor.
Step 1.2.2.2.1.2
Divide by .
Step 1.2.2.3
Simplify the right side.
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Step 1.2.2.3.1
Move the negative in front of the fraction.
Step 1.3
In the piece where is non-negative, remove the absolute value.
Step 1.4
To find the interval for the second piece, find where the inside of the absolute value is negative.
Step 1.5
Solve the inequality.
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Step 1.5.1
Subtract from both sides of the inequality.
Step 1.5.2
Divide each term in by and simplify.
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Step 1.5.2.1
Divide each term in by .
Step 1.5.2.2
Simplify the left side.
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Step 1.5.2.2.1
Cancel the common factor of .
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Step 1.5.2.2.1.1
Cancel the common factor.
Step 1.5.2.2.1.2
Divide by .
Step 1.5.2.3
Simplify the right side.
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Step 1.5.2.3.1
Move the negative in front of the fraction.
Step 1.6
In the piece where is negative, remove the absolute value and multiply by .
Step 1.7
Write as a piecewise.
Step 1.8
Simplify .
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Step 1.8.1
Apply the distributive property.
Step 1.8.2
Multiply by .
Step 1.8.3
Multiply by .
Step 2
Solve for .
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Step 2.1
Move all terms not containing to the right side of the inequality.
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Step 2.1.1
Subtract from both sides of the inequality.
Step 2.1.2
Subtract from .
Step 2.2
Divide each term in by and simplify.
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Step 2.2.1
Divide each term in by .
Step 2.2.2
Simplify the left side.
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Step 2.2.2.1
Cancel the common factor of .
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Step 2.2.2.1.1
Cancel the common factor.
Step 2.2.2.1.2
Divide by .
Step 2.2.3
Simplify the right side.
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Step 2.2.3.1
Divide by .
Step 3
Solve for .
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Step 3.1
Move all terms not containing to the right side of the inequality.
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Step 3.1.1
Add to both sides of the inequality.
Step 3.1.2
Add and .
Step 3.2
Divide each term in by and simplify.
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Step 3.2.1
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 3.2.2
Simplify the left side.
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Step 3.2.2.1
Cancel the common factor of .
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Step 3.2.2.1.1
Cancel the common factor.
Step 3.2.2.1.2
Divide by .
Step 3.2.3
Simplify the right side.
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Step 3.2.3.1
Divide by .
Step 4
Find the union of the solutions.
or
Step 5
The result can be shown in multiple forms.
Inequality Form:
Interval Notation:
Step 6