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Solve for the roots in simplest form by completing the square: \[ 4 x^{2}-32 x+244=0 \]

Ask by Murphy Turner. in the United States
Jan 27,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The roots are \( x = 4 + 3\sqrt{5}i \) and \( x = 4 - 3\sqrt{5}i \).

Solution

To solve the quadratic equation \( 4x^{2} - 32x + 244 = 0 \) by completing the square, follow these steps: 1. **Divide the entire equation by 4** to simplify: \[ x^{2} - 8x + 61 = 0 \] 2. **Move the constant term to the other side**: \[ x^{2} - 8x = -61 \] 3. **Complete the square**: - Take half of the coefficient of \( x \), which is \(-8\), resulting in \(-4\). - Square this value: \((-4)^2 = 16\). - Add 16 to both sides of the equation: \[ x^{2} - 8x + 16 = -61 + 16 \] \[ (x - 4)^2 = -45 \] 4. **Solve for \( x \)** by taking the square root of both sides: \[ x - 4 = \pm \sqrt{-45} \] \[ x - 4 = \pm 3\sqrt{5}i \] 5. **Isolate \( x \)**: \[ x = 4 \pm 3\sqrt{5}i \] **Final Answer:** \[ x = 4 + 3\,\sqrt{5}\,i \quad \text{and} \quad x = 4 - 3\,\sqrt{5}\,i \]

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The Deep Dive

To solve the equation \( 4 x^{2} - 32 x + 244 = 0 \) by completing the square, let's start by simplifying it. 1. Divide the entire equation by 4: \[ x^2 - 8x + 61 = 0 \] 2. Move the constant term to the other side: \[ x^2 - 8x = -61 \] 3. To complete the square, take half of the coefficient of \( x \) (which is \(-8\)), square it, and add it to both sides. Half of \(-8\) is \(-4\), and squaring gives us \(16\): \[ x^2 - 8x + 16 = -61 + 16 \] \[ x^2 - 8x + 16 = -45 \] 4. Now, the left-hand side can be factored as a square: \[ (x - 4)^2 = -45 \] 5. Taking the square root of both sides: \[ x - 4 = \pm \sqrt{-45} \] \[ x - 4 = \pm \sqrt{45} i \] Since \(\sqrt{-1}\) is \(i\) and \(\sqrt{45} = 3\sqrt{5}\): \[ x - 4 = \pm 3\sqrt{5} i \] 6. Finally, add 4 to both sides to find \( x \): \[ x = 4 \pm 3\sqrt{5} i \] The roots of the equation \( 4 x^{2} - 32 x + 244 = 0 \) are: \[ x = 4 + 3\sqrt{5} i \quad \text{and} \quad x = 4 - 3\sqrt{5} i \]

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