Question
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\( x^{2}+12 x+45=0 \). Enter multiple answers as a list separated by commas. Example: \( 2+2 i, 2-2 i \)

Ask by Simpson Chandler. in the United States
Jan 23,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The solutions are \(x=-6-3i\) and \(x=-6+3i\).

Solution

Solve the equation \( x^{2}+12x+45=0 \). Solve the equation(The complex numbers system) by following steps: - step0: Solve using the quadratic formula in the complex numbers system: \(x^{2}+12x+45=0\) - step1: Solve using the quadratic formula: \(x=\frac{-12\pm \sqrt{12^{2}-4\times 45}}{2}\) - step2: Simplify the expression: \(x=\frac{-12\pm \sqrt{-36}}{2}\) - step3: Simplify the expression: \(x=\frac{-12\pm 6i}{2}\) - step4: Separate into possible cases: \(\begin{align}&x=\frac{-12+6i}{2}\\&x=\frac{-12-6i}{2}\end{align}\) - step5: Simplify the expression: \(\begin{align}&x=-6+3i\\&x=\frac{-12-6i}{2}\end{align}\) - step6: Simplify the expression: \(\begin{align}&x=-6+3i\\&x=-6-3i\end{align}\) - step7: Rewrite: \(x_{1}=-6-3i,x_{2}=-6+3i\) - step8: Remove the complex number(s): \(\textrm{No real solution}\) The equation \(x^{2}+12x+45=0\) does not have any real solutions. Therefore, the solutions are complex numbers. Solve the equation(The complex numbers system) by following steps: - step0: Solve using the quadratic formula in the complex numbers system: \(x^{2}+12x+45=0\) - step1: Solve using the quadratic formula: \(x=\frac{-12\pm \sqrt{12^{2}-4\times 45}}{2}\) - step2: Simplify the expression: \(x=\frac{-12\pm \sqrt{-36}}{2}\) - step3: Simplify the expression: \(x=\frac{-12\pm 6i}{2}\) - step4: Separate into possible cases: \(\begin{align}&x=\frac{-12+6i}{2}\\&x=\frac{-12-6i}{2}\end{align}\) - step5: Simplify the expression: \(\begin{align}&x=-6+3i\\&x=\frac{-12-6i}{2}\end{align}\) - step6: Simplify the expression: \(\begin{align}&x=-6+3i\\&x=-6-3i\end{align}\) - step7: Rewrite: \(x_{1}=-6-3i,x_{2}=-6+3i\) The solutions to the equation \(x^{2}+12x+45=0\) are \(x=-6-3i\) and \(x=-6+3i\).

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Bonus Knowledge

To solve the quadratic equation \( x^{2}+12 x+45=0 \), we can use the quadratic formula: \[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \] Here, \( a = 1 \), \( b = 12 \), and \( c = 45 \). First, we calculate the discriminant: \[ b^2 - 4ac = 12^2 - 4(1)(45) = 144 - 180 = -36 \] Since the discriminant is negative, the solutions will be complex numbers. Now substituting into the quadratic formula: \[ x = \frac{-12 \pm \sqrt{-36}}{2(1)} = \frac{-12 \pm 6i}{2} = -6 \pm 3i \] The solutions are: \[ -6 + 3i, -6 - 3i \]

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