Question
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\( y ^ { 3 } x \geq y ^ { - 2 } \)

Ask by Riley Garrett. in Saudi Arabia
Mar 09,2025

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Answer

الحل النهائي للمتباينة هو: - إذا كان \( y > 0 \): \( x \geq \frac{1}{y^5} \) - إذا كان \( y < 0 \): \( x \leq \frac{1}{y^5} \)

Solution

1. نبدأ من المتباينة الأصلية: \[ y^3 x \geq y^{-2} \] 2. نلاحظ أن \( y^{-2} = \frac{1}{y^2} \) والتعبير معرف بشرط \( y \neq 0 \). 3. لضرب كلا الطرفين بـ\( y^2 \) (وهو عدد موجب لأن \( y^2 > 0 \) عندما \( y \neq 0 \)) نحصل على: \[ y^3 x \cdot y^2 \geq y^{-2} \cdot y^2 \] وبما أن \( y^3 \cdot y^2 = y^5 \) و\( y^{-2} \cdot y^2 = 1 \)، تصبح المتباينة: \[ x y^5 \geq 1 \] 4. للتحليل نُقسم إلى حالتين حسب إشارة \( y^5 \): - **الحالة الأولى: \( y > 0 \)** بما أن \( y > 0 \) فإن \( y^5 > 0 \). عندها نقسم على \( y^5 \) بدون تغيير إشارة المتباينة: \[ x \geq \frac{1}{y^5} \] - **الحالة الثانية: \( y < 0 \)** بما أن \( y < 0 \) فإن \( y^5 < 0 \). عندها نقسم على \( y^5 \) ويتغير اتجاه المتباينة: \[ x \leq \frac{1}{y^5} \] 5. إذن، الحل النهائي للمتباينة مع اعتبار \( y \neq 0 \) هو: - إذا كان \( y > 0 \)، فإن: \[ x \geq \frac{1}{y^5} \] - إذا كان \( y < 0 \)، فإن: \[ x \leq \frac{1}{y^5} \]

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The Deep Dive

To solve the inequality \( y^{3} x \geq y^{-2} \), we can first rearrange it to bring all terms to one side: \( y^{3} x - y^{-2} \geq 0 \). To eliminate the fraction, we can multiply through by \( y^{2} \) (assuming \( y \neq 0 \)), resulting in \( y^{5} x - 1 \geq 0 \). This leads us to \( y^{5} x \geq 1 \), indicating that for positive \( x \), we need \( y \) to satisfy \( y \geq (1/x)^{1/5} \). It’s always useful to remember that inequalities can change when multiplying or dividing by negative values; hence, the signs of \( x \) and \( y \) play a crucial role in determining the solution set. To visualize this, considering graphs can be really effective. Plotting \( y^{5} x = 1 \) can show how the inequality behaves across different quadrants, helping you to understand where \( y \) is constrained by the value of \( x \) in a tangible way.

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