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1) \( x^{3}+5 x^{2}-16 x-8 \) 2) \( x^{3}+8 x^{2}=x+8 \)

Ask by Frazier Salinas. in Russia
Jan 27,2025

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Answer

Корни уравнения \( x^{3}+5 x^{2}-16 x-8=0 \): - \( x \approx -7.095932 \) - \( x \approx -0.443892 \) - \( x \approx 2.539824 \) Корни уравнения \( x^{3}+8 x^{2}-x-8=0 \): - \( x = -8 \) - \( x = -1 \) - \( x = 1 \)

Solution

Solve the equation by following steps: - step0: Solve for \(x\): \(x^{3}+8x^{2}-x-8=0\) - step1: Factor the expression: \(\left(x-1\right)\left(x+1\right)\left(x+8\right)=0\) - step2: Separate into possible cases: \(\begin{align}&x-1=0\\&x+1=0\\&x+8=0\end{align}\) - step3: Solve the equation: \(\begin{align}&x=1\\&x=-1\\&x=-8\end{align}\) - step4: Rewrite: \(x_{1}=-8,x_{2}=-1,x_{3}=1\) Solve the equation \( x^{3}+5 x^{2}-16 x-8=0 \). Solve the equation by following steps: - step0: Solve for \(x\): \(x^{3}+5x^{2}-16x-8=0\) - step1: Calculate: \(\begin{align}&x\approx -7.095932\\&x\approx -0.443892\\&x\approx 2.539824\end{align}\) - step2: Rewrite: \(x_{1}\approx -7.095932,x_{2}\approx -0.443892,x_{3}\approx 2.539824\) Решим оба уравнения по очереди. 1) Для уравнения \( x^{3}+5 x^{2}-16 x-8=0 \) мы получили следующие корни: - \( x_{1} \approx -7.095932 \) - \( x_{2} \approx -0.443892 \) - \( x_{3} \approx 2.539824 \) 2) Для уравнения \( x^{3}+8 x^{2}-x-8=0 \) корни следующие: - \( x_{1} = -8 \) - \( x_{2} = -1 \) - \( x_{3} = 1 \) Таким образом, у нас есть три корня для первого уравнения и три корня для второго уравнения.

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Extra Insights

Did you know that cubic equations have fascinated mathematicians for centuries? The general form of a cubic equation, like the two you’ve presented, can be traced back to the Renaissance when mathematicians such as Gerolamo Cardano started finding methods to solve them. This quest led to the development of complex numbers and the fundamentals of algebra that we use today! In the real world, cubic equations appear in various scenarios, such as calculating the volume of a box given its dimensions, or modeling situations in physics where acceleration is involved. They can depict growth rates and optimize solutions in engineering projects. So, next time you're solving for \(x\), remember that you're tapping into centuries of mathematical evolution applied to real-life challenges!

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