Algebra Examples

Solve by Factoring x^4=81
Step 1
Subtract from both sides of the equation.
Step 2
Rewrite as .
Step 3
Rewrite as .
Step 4
Since both terms are perfect squares, factor using the difference of squares formula, where and .
Step 5
Simplify.
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Step 5.1
Rewrite as .
Step 5.2
Factor.
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Step 5.2.1
Since both terms are perfect squares, factor using the difference of squares formula, where and .
Step 5.2.2
Remove unnecessary parentheses.
Step 6
If any individual factor on the left side of the equation is equal to , the entire expression will be equal to .
Step 7
Set equal to and solve for .
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Step 7.1
Set equal to .
Step 7.2
Solve for .
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Step 7.2.1
Subtract from both sides of the equation.
Step 7.2.2
Take the specified root of both sides of the equation to eliminate the exponent on the left side.
Step 7.2.3
Simplify .
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Step 7.2.3.1
Rewrite as .
Step 7.2.3.2
Rewrite as .
Step 7.2.3.3
Rewrite as .
Step 7.2.3.4
Rewrite as .
Step 7.2.3.5
Pull terms out from under the radical, assuming positive real numbers.
Step 7.2.3.6
Move to the left of .
Step 7.2.4
The complete solution is the result of both the positive and negative portions of the solution.
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Step 7.2.4.1
First, use the positive value of the to find the first solution.
Step 7.2.4.2
Next, use the negative value of the to find the second solution.
Step 7.2.4.3
The complete solution is the result of both the positive and negative portions of the solution.
Step 8
Set equal to and solve for .
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Step 8.1
Set equal to .
Step 8.2
Subtract from both sides of the equation.
Step 9
Set equal to and solve for .
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Step 9.1
Set equal to .
Step 9.2
Add to both sides of the equation.
Step 10
The final solution is all the values that make true.