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2.1. Solve for \( x \) 2.1.1. \( \quad 2 x^{2}-12 x=-32 \)

Ask by Mejia Rogers. in South Africa
Mar 10,2025

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Tutor-Verified Answer

Answer

The solutions are \( x = 3 - \sqrt{7}i \) and \( x = 3 + \sqrt{7}i \).

Solution

Solve the equation \( 2x^{2}-12x=-32 \). Solve the equation(The complex numbers system) by following steps: - step0: Solve using the quadratic formula in the complex numbers system: \(2x^{2}-12x=-32\) - step1: Move the expression to the left side: \(2x^{2}-12x+32=0\) - step2: Solve using the quadratic formula: \(x=\frac{12\pm \sqrt{\left(-12\right)^{2}-4\times 2\times 32}}{2\times 2}\) - step3: Simplify the expression: \(x=\frac{12\pm \sqrt{\left(-12\right)^{2}-4\times 2\times 32}}{4}\) - step4: Simplify the expression: \(x=\frac{12\pm \sqrt{-112}}{4}\) - step5: Simplify the expression: \(x=\frac{12\pm 4\sqrt{7}\times i}{4}\) - step6: Separate into possible cases: \(\begin{align}&x=\frac{12+4\sqrt{7}\times i}{4}\\&x=\frac{12-4\sqrt{7}\times i}{4}\end{align}\) - step7: Simplify the expression: \(\begin{align}&x=3+\sqrt{7}\times i\\&x=\frac{12-4\sqrt{7}\times i}{4}\end{align}\) - step8: Simplify the expression: \(\begin{align}&x=3+\sqrt{7}\times i\\&x=3-\sqrt{7}\times i\end{align}\) - step9: Rewrite: \(x_{1}=3-\sqrt{7}\times i,x_{2}=3+\sqrt{7}\times i\) The solutions to the equation \(2x^{2}-12x=-32\) are \(x_{1}=3-\sqrt{7}i\) and \(x_{2}=3+\sqrt{7}i\).

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Beyond the Answer

To solve for \( x \) in the equation \( 2x^{2} - 12x + 32 = 0 \), we start by rearranging it into standard form. Adding 32 to both sides gives us \( 2x^{2} - 12x + 32 = 0 \). We can simplify this equation by dividing everything by 2, resulting in \( x^{2} - 6x + 16 = 0 \). Next, we can use the quadratic formula \( x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \), where \( a = 1, b = -6, c = 16 \). Plugging in these values gives us \( x = \frac{6 \pm \sqrt{(-6)^2 - 4 \cdot 1 \cdot 16}}{2 \cdot 1} = \frac{6 \pm \sqrt{36 - 64}}{2} = \frac{6 \pm \sqrt{-28}}{2} \). Since the discriminant (the part under the square root) is negative, we conclude that the solutions are complex. Hence, the solutions are \( x = 3 \pm i\sqrt{7} \). Now, you can impress your friends with the fact that this equation has no real solutions, but instead opens the door to the fascinating world of complex numbers! Want to dive deeper? Complex numbers, like a mathematical party of real and imaginary, have unique properties that extend beyond our everyday experiences!

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