what with you do develop you camunity /
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Khách
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L
0
11 tháng 1 2021
y = (x² - 1)(x + 3)(x + 5)
= [(x - 1)(x + 5)].[(x + 1)(x + 3)]
= (x² + 4x - 5)(x² + 4x + 3)
= [x² + 4x - 1) - 4].[(x² + 4x - 1) + 4]
= (x² + 4x - 1)² - 16 ≥ - 16
- Khi x = 0 ⇒ y = - 15
- Khi x = 1 ⇒ y = 0
- Khi x² + 4x - 1 = 0 ⇔ x = √5 - 2 ( loại giá trị x = - √5 - 2 < 0) ⇒ y = - 16
Vậy trên đoạn [0; 1] thì :
GTNN của y = - 16 khi x = √5 - 2
GTLN của y = 0 khi x = 1
VD
13 tháng 12 2020
hi , my name is bao am from vn and i live in ha giang city
- where do you live
-how old are you
but chat on english
ha ha
There are a lot of ways to help our community. Firstly, get involved as a volunteer. You can visit someone in the hospital or work in a charity shop voluntarily. Secondly, tidy up. Small things litter picking and gardening can help to make your local area a nicer place to live for everyone. Thirdly, help your neighbors. Take the time to get to know the people around you and see how you can help them is a good idea. Finally, donate things. Consider donating unwanted clothing, jewelry, media, books, and homeware to charity shops. You can not only help people with difficulties in your community but also protect the environment.