Question
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Use the quadratic formula to solve the equation. \( x^{2}-4 x+10=0 \) The solution set is \( \{\square\} \). (Type an exact answer, using radicals and \( i \) as needed. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.)

Ask by Whittaker Ortega. in the United States
Mar 09,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

The solutions are \( x = 2 + i\sqrt{6} \) and \( x = 2 - i\sqrt{6} \).

Solution

1. Write the equation in standard form: \[ x^2 - 4x + 10 = 0 \] 2. Identify the coefficients: \[ a = 1,\quad b = -4,\quad c = 10 \] 3. Apply the quadratic formula: \[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \] 4. Substitute the coefficients: \[ x = \frac{-(-4) \pm \sqrt{(-4)^2 - 4(1)(10)}}{2(1)} = \frac{4 \pm \sqrt{16 - 40}}{2} \] 5. Simplify the expression under the square root: \[ 16 - 40 = -24 \] So, \[ x = \frac{4 \pm \sqrt{-24}}{2} \] 6. Express the square root of the negative number in terms of \( i \): \[ \sqrt{-24} = i\sqrt{24} = i\sqrt{4 \cdot 6} = 2i\sqrt{6} \] Therefore, \[ x = \frac{4 \pm 2i\sqrt{6}}{2} \] 7. Simplify by dividing the numerator by \( 2 \): \[ x = 2 \pm i\sqrt{6} \] 8. The solution set is: \[ \{2 + i\sqrt{6},\; 2 - i\sqrt{6}\} \]

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The Deep Dive

To solve the equation \( x^{2}-4x+10=0 \) using the quadratic formula, we start with identifying the coefficients: \( a = 1 \), \( b = -4 \), and \( c = 10 \). The quadratic formula is given by: \[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \] Plugging in the values: \[ x = \frac{-(-4) \pm \sqrt{(-4)^2 - 4 \cdot 1 \cdot 10}}{2 \cdot 1} \] This simplifies to: \[ x = \frac{4 \pm \sqrt{16 - 40}}{2} \] Calculating the discriminant: \[ 16 - 40 = -24 \] Now substituting this back into our solution: \[ x = \frac{4 \pm \sqrt{-24}}{2} \] Since \(\sqrt{-24} = \sqrt{24} \cdot i = 2\sqrt{6} i\), we can rewrite it as: \[ x = \frac{4 \pm 2\sqrt{6} i}{2} \] Simplifying further: \[ x = 2 \pm \sqrt{6} i \] Thus, the solution set is: \[ \{ 2 + \sqrt{6} i, 2 - \sqrt{6} i \} \]

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