Question
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Solve the quadratic formula to solve \( 9 x^{2}=12 x+2 \). \[ x= \] Simplify your answers, using square roots as needed. If there is more than 1 solution, separate the answers with a comma.

Ask by Davey Coles. in the United States
Feb 27,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

\( x=\frac{2-\sqrt{6}}{3}, \frac{2+\sqrt{6}}{3} \)

Solution

Solve the equation \( 9x^2=12x+2 \). Solve the quadratic equation by following steps: - step0: Solve using the quadratic formula: \(9x^{2}=12x+2\) - step1: Move the expression to the left side: \(9x^{2}-12x-2=0\) - step2: Solve using the quadratic formula: \(x=\frac{12\pm \sqrt{\left(-12\right)^{2}-4\times 9\left(-2\right)}}{2\times 9}\) - step3: Simplify the expression: \(x=\frac{12\pm \sqrt{\left(-12\right)^{2}-4\times 9\left(-2\right)}}{18}\) - step4: Simplify the expression: \(x=\frac{12\pm \sqrt{216}}{18}\) - step5: Simplify the expression: \(x=\frac{12\pm 6\sqrt{6}}{18}\) - step6: Separate into possible cases: \(\begin{align}&x=\frac{12+6\sqrt{6}}{18}\\&x=\frac{12-6\sqrt{6}}{18}\end{align}\) - step7: Simplify the expression: \(\begin{align}&x=\frac{2+\sqrt{6}}{3}\\&x=\frac{12-6\sqrt{6}}{18}\end{align}\) - step8: Simplify the expression: \(\begin{align}&x=\frac{2+\sqrt{6}}{3}\\&x=\frac{2-\sqrt{6}}{3}\end{align}\) - step9: Rewrite: \(x_{1}=\frac{2-\sqrt{6}}{3},x_{2}=\frac{2+\sqrt{6}}{3}\) The solutions to the quadratic equation \(9x^{2}=12x+2\) are \(x=\frac{2-\sqrt{6}}{3}\) and \(x=\frac{2+\sqrt{6}}{3}\).

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Extra Insights

First, we rearrange the equation \( 9x^2 - 12x - 2 = 0 \). In the quadratic formula, \( x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \), we identify \( a = 9 \), \( b = -12 \), and \( c = -2 \). Calculating the discriminant: \[ b^2 - 4ac = (-12)^2 - 4(9)(-2) = 144 + 72 = 216. \] Next, we apply the quadratic formula: \[ x = \frac{12 \pm \sqrt{216}}{18}. \] Simplifying further: \[ \sqrt{216} = \sqrt{36 \times 6} = 6\sqrt{6}. \] Thus, \[ x = \frac{12 \pm 6\sqrt{6}}{18} = \frac{2 \pm \sqrt{6}}{3}. \] So, the solutions are: \[ x = \frac{2 + \sqrt{6}}{3}, \frac{2 - \sqrt{6}}{3}. \]

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