Question
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Solve the equation by using the quadratic formula \( x^{2}+8 x+5=0 \)

Ask by Best John. in the United States
Jan 24,2025

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Answer

The solutions are \(x = -4 - \sqrt{11}\) and \(x = -4 + \sqrt{11}\).

Solution

Solve the equation \( x^{2}+8x+5=0 \). Solve the quadratic equation by following steps: - step0: Solve using the quadratic formula: \(x^{2}+8x+5=0\) - step1: Solve using the quadratic formula: \(x=\frac{-8\pm \sqrt{8^{2}-4\times 5}}{2}\) - step2: Simplify the expression: \(x=\frac{-8\pm \sqrt{44}}{2}\) - step3: Simplify the expression: \(x=\frac{-8\pm 2\sqrt{11}}{2}\) - step4: Separate into possible cases: \(\begin{align}&x=\frac{-8+2\sqrt{11}}{2}\\&x=\frac{-8-2\sqrt{11}}{2}\end{align}\) - step5: Simplify the expression: \(\begin{align}&x=-4+\sqrt{11}\\&x=\frac{-8-2\sqrt{11}}{2}\end{align}\) - step6: Simplify the expression: \(\begin{align}&x=-4+\sqrt{11}\\&x=-4-\sqrt{11}\end{align}\) - step7: Rewrite: \(x_{1}=-4-\sqrt{11},x_{2}=-4+\sqrt{11}\) The solutions to the equation \(x^{2}+8x+5=0\) using the quadratic formula are \(x_{1}=-4-\sqrt{11}\) and \(x_{2}=-4+\sqrt{11}\).

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Mind Expander

To solve the equation \( x^{2} + 8x + 5 = 0 \) using the quadratic formula, which is \( x = \frac{{-b \pm \sqrt{{b^2 - 4ac}}}}{2a} \), identify the coefficients \( a = 1 \), \( b = 8 \), and \( c = 5 \). Plugging in these values: 1. Calculate the discriminant: \( b^2 - 4ac = 8^2 - 4(1)(5) = 64 - 20 = 44 \). 2. Now, use the quadratic formula: \( x = \frac{{-8 \pm \sqrt{44}}}{2(1)} = \frac{{-8 \pm 2\sqrt{11}}}{2} = -4 \pm \sqrt{11} \). Thus, the solutions are \( x = -4 + \sqrt{11} \) and \( x = -4 - \sqrt{11} \). Now you have your two solutions. Happy solving!

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