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y³ - 8 - 6y(y - 2)
= (y³ - 8) - 6y(y - 2)
= (y - 2)(y² + 2y + 4) - 6y(y - 2)
= (y - 2)(y² + 2y + 4 - 6y)
= (y - 2)(y² - 4y + 4)
= (y - 2)(y - 2)²
= (y - 2)³
y³ - 8 - 6y(y - 2)
= (y³ - 8) - 6y(y - 2)
= (y - 2)(y² + 2y + 4) - 6y(y - 2)
= (y - 2)(y² + 2y + 4 - 6y)
= (y - 2)(y² - 4y + 4)
= (y - 2)(y - 2)²
P = \(\dfrac{2x+3}{x+3}\) (đk \(x\ne\) - 3; \(x\in\) Z-
P \(\in\) Z ⇔ 2\(x\) + 3 ⋮ \(x\) + 3
2\(x\) + 6 -3 ⋮ \(x\) + 3
2.(\(x\) + 3) - 3 ⋮ \(x\) + 3
3 \(⋮\) \(x\) + 3
\(x\) + 3 \(\in\) Ư(3) = {-3; -1; 1; 3}
Lập bảng ta có:
\(x\) + 3 | - 3 | -1 | 1 | 3 |
\(x\) | -6 | -4 | -2 | 0 |
Vì \(x\) \(\in\) Z- nên theo bảng trên ta có:
\(x\) \(\in\) {- 6; - 4; -2}
Dear [Pen Friend's Name],
I hope this letter finds you well. I wanted to take the time to update you on the situation here in Nigeria. Recently, our country has been facing several challenges including political instability, economic downturn, and security concerns. The government has been taking steps to address these issues, but progress has been slow.
In terms of the economy, we have been experiencing inflation and rising food prices, which has been difficult for many families. Additionally, the COVID-19 pandemic has had a significant impact on our healthcare system and economy.
On the political front, there have been protests and demonstrations against police brutality and human rights abuses. While these issues have been ongoing, there has been increased attention on them in recent months.
Despite these challenges, Nigeria remains a resilient and diverse country with many positive aspects. Our culture and traditions continue to thrive, and many people are working hard to make a positive impact in their communities.
I hope this update provides you with a better understanding of the current situation in Nigeria. I look forward to hearing from you soon and catching up on all that is new with you.
Best regards, [Your Name]