$\"\"$

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The equation is $\"\"$ .

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Solve the equation.

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Case(i):

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$\"\"$ (First equation)

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$\"\"$ (Subtract $\"\"$ from each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Divide each side by $\"\"$ )

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$\"\"$ (Cancel common terms)

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Case(ii):

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$\"\"$ (Second equation)

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$\"\"$ (Subtract $\"\"$ from each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Divide each side by $\"\"$ )

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$\"\"$ (Cancel common terms)

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The solution is $\"\"$ .

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$\"\"$ is extraneous solution.

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Ling; Ana included an extraneous solution.

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She would have caught this error if she had checked to see if her answers were correct by

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substituting the values into the original equation.

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$\"\"$

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Ling considered the correct solutions. \ \