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What is true about the solution of \( \frac{x^{2}}{2 x-6}=\frac{9}{6 x-18} ? \) \( x= \pm \sqrt{3} \), and they are actual solutions. \( x= \pm \sqrt{3} \), but they are extraneous solutions. \( x=3 \), and it is an actual solution. \( x=-3 \), but it is an extraneous solution.

Ask by Deleon Carter. in the United States
Mar 11,2025

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Tutor-Verified Answer

Answer

The solutions are \( x = \sqrt{3} \) and \( x = -\sqrt{3} \), and they are actual solutions.

Solution

**Step 1. Domain Restriction** The given equation is \[ \frac{x^{2}}{2x-6}=\frac{9}{6x-18}\,. \] Notice that the denominators cannot be zero. Thus, we require: - \(2x-6 \neq 0 \implies x \neq 3\), - \(6x-18 \neq 0 \implies x \neq 3\). Thus, \(x=3\) is excluded. **Step 2. Simplify the Equation** Observe that \[ 6x-18 = 3(2x-6)\,. \] Thus, the equation can be written as: \[ \frac{x^2}{2x-6}=\frac{9}{3(2x-6)}\,. \] Multiply both sides of the equation by \(3(2x-6)\) (which is allowed as \(2x-6 \neq 0\)): \[ 3(2x-6)\cdot\frac{x^2}{2x-6} = 3(2x-6)\cdot\frac{9}{3(2x-6)}\,. \] Simplifying, we cancel the common factor \(2x-6\): \[ 3x^2 = 9\,. \] **Step 3. Solve for \(x\)** Divide both sides by 3: \[ x^2 = 3\,. \] Taking the square root: \[ x = \pm \sqrt{3}\,. \] **Step 4. Verify the Solutions** The solutions \(x=\sqrt{3}\) and \(x=-\sqrt{3}\) do not violate the domain restriction \(x \neq 3\). **Conclusion** The solutions are \(x=\pm\sqrt{3}\) and they are actual solutions.

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The Deep Dive

To solve the equation \( \frac{x^{2}}{2 x-6}=\frac{9}{6 x-18} \), you first notice that both sides can be simplified, leading to the identification of critical points. Remember, while solving such equations, it’s vital to check for restrictions on the variable due to division by zero. When checking, you'll find that the simplifications yield \( x = 3 \) as a potential solution, but it also turns out to be a point where the denominator becomes zero. Therefore, it’s considered an extraneous solution. Always check back with the original equation to confirm if solutions are valid or simply illusions created through the solving process!

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