Linear Algebra Examples

Find the Domain 1/49x^2+1/9y^2=1
Step 1
Simplify each term.
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Step 1.1
Combine and .
Step 1.2
Combine and .
Step 2
Subtract from both sides of the equation.
Step 3
Multiply both sides of the equation by .
Step 4
Simplify both sides of the equation.
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Step 4.1
Simplify the left side.
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Step 4.1.1
Cancel the common factor of .
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Step 4.1.1.1
Cancel the common factor.
Step 4.1.1.2
Rewrite the expression.
Step 4.2
Simplify the right side.
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Step 4.2.1
Simplify .
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Step 4.2.1.1
Apply the distributive property.
Step 4.2.1.2
Multiply by .
Step 4.2.1.3
Multiply .
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Step 4.2.1.3.1
Multiply by .
Step 4.2.1.3.2
Combine and .
Step 4.2.1.4
Move the negative in front of the fraction.
Step 5
Take the specified root of both sides of the equation to eliminate the exponent on the left side.
Step 6
Simplify .
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Step 6.1
Write the expression using exponents.
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Step 6.1.1
Rewrite as .
Step 6.1.2
Rewrite as .
Step 6.2
Since both terms are perfect squares, factor using the difference of squares formula, where and .
Step 6.3
To write as a fraction with a common denominator, multiply by .
Step 6.4
Combine and .
Step 6.5
Combine the numerators over the common denominator.
Step 6.6
Factor out of .
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Step 6.6.1
Factor out of .
Step 6.6.2
Factor out of .
Step 6.6.3
Factor out of .
Step 6.7
To write as a fraction with a common denominator, multiply by .
Step 6.8
Combine and .
Step 6.9
Combine the numerators over the common denominator.
Step 6.10
Factor out of .
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Step 6.10.1
Factor out of .
Step 6.10.2
Factor out of .
Step 6.10.3
Factor out of .
Step 6.11
Multiply by .
Step 6.12
Multiply.
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Step 6.12.1
Multiply by .
Step 6.12.2
Multiply by .
Step 6.13
Rewrite as .
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Step 6.13.1
Factor the perfect power out of .
Step 6.13.2
Factor the perfect power out of .
Step 6.13.3
Rearrange the fraction .
Step 6.14
Pull terms out from under the radical.
Step 6.15
Combine and .
Step 7
The complete solution is the result of both the positive and negative portions of the solution.
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Step 7.1
First, use the positive value of the to find the first solution.
Step 7.2
Next, use the negative value of the to find the second solution.
Step 7.3
The complete solution is the result of both the positive and negative portions of the solution.
Step 8
Set the radicand in greater than or equal to to find where the expression is defined.
Step 9
Solve for .
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Step 9.1
If any individual factor on the left side of the equation is equal to , the entire expression will be equal to .
Step 9.2
Set equal to and solve for .
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Step 9.2.1
Set equal to .
Step 9.2.2
Subtract from both sides of the equation.
Step 9.3
Set equal to and solve for .
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Step 9.3.1
Set equal to .
Step 9.3.2
Solve for .
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Step 9.3.2.1
Subtract from both sides of the equation.
Step 9.3.2.2
Divide each term in by and simplify.
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Step 9.3.2.2.1
Divide each term in by .
Step 9.3.2.2.2
Simplify the left side.
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Step 9.3.2.2.2.1
Dividing two negative values results in a positive value.
Step 9.3.2.2.2.2
Divide by .
Step 9.3.2.2.3
Simplify the right side.
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Step 9.3.2.2.3.1
Divide by .
Step 9.4
The final solution is all the values that make true.
Step 9.5
Use each root to create test intervals.
Step 9.6
Choose a test value from each interval and plug this value into the original inequality to determine which intervals satisfy the inequality.
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Step 9.6.1
Test a value on the interval to see if it makes the inequality true.
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Step 9.6.1.1
Choose a value on the interval and see if this value makes the original inequality true.
Step 9.6.1.2
Replace with in the original inequality.
Step 9.6.1.3
The left side is less than the right side , which means that the given statement is false.
False
False
Step 9.6.2
Test a value on the interval to see if it makes the inequality true.
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Step 9.6.2.1
Choose a value on the interval and see if this value makes the original inequality true.
Step 9.6.2.2
Replace with in the original inequality.
Step 9.6.2.3
The left side is greater than the right side , which means that the given statement is always true.
True
True
Step 9.6.3
Test a value on the interval to see if it makes the inequality true.
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Step 9.6.3.1
Choose a value on the interval and see if this value makes the original inequality true.
Step 9.6.3.2
Replace with in the original inequality.
Step 9.6.3.3
The left side is less than the right side , which means that the given statement is false.
False
False
Step 9.6.4
Compare the intervals to determine which ones satisfy the original inequality.
False
True
False
False
True
False
Step 9.7
The solution consists of all of the true intervals.
Step 10
The domain is all values of that make the expression defined.
Interval Notation:
Set-Builder Notation:
Step 11