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Himpunan penyelesaian dari |(2x+7)/(x−1)|=1 adalah …

Himpunan penyelesaian dari |(2x+7)/(x−1)|=1 adalah …

Jawaban : {-8, -2}

Perhatikan penjelasan berikut ya.

Ingat kembali:
|f(x)| = a → f(x) = a jika f(x) ≥ 0
|f(x)| = a → f(x) = -a jika f(x) < 0

Diketahui : |(2x + 7) / (x − 1)| = 1

Ditanya : Himpunan penyelesaian = … ?

Maka:
untuk x ≥ 0
|(2x + 7) / (x − 1)| = 1
(2x + 7) /(x – 1) = 1
2x + 7 = 1 . (x – 1)
2x + 7 = x – 1
2x – x = -1 – 7
x = -8

untuk x < 0
|(2x + 7) / (x − 1)| = 1
(2x + 7) / (x – 1) = -1
2x + 7 = (-1) . (x – 1)
2x + 7 = -x + 1
2x + x = 1 – 7
3x = -6
x = -6 / 3
x = -2

Jadi, himpunan penyelesaiannya adalah {-8, -2}.

Baca Juga :  Complete the sentences with a form of the verb in parentheses. Three hundred and fifty years ago, people (1. make) /made/ their own clothes. They (2. have, not) _____ machines for making clothes. There (3. be, not) _____ any clothing factories. People (4. tear) _____ homemade clothes that were sewn by hand. Today, very few people (5. make) _____ their own clothes. Clothing (6. come) _____ ready-made from factories. People (7. buy) _____ almost all their clothes from stores. The modern clothing industry (8. be) _____ international. As a result, people from different countries often (9. wear) _____ similar clothes. For example, people in many different countries throughout the world (10. wear) _____ jeans and t-shirts. However, some regional differences in clothing still (11. exist) _____ for instance, people of the Arabian deserts (12. wear) _____ loose, flowing lobes to protect themselves from the heat of the sun. In parts of Northern Europe, fur hats (13. be) _____ common in the winter. In the future, there (14. be, probably) _____ fewer and fewer differences in clothing. People throughout the world (15. wear) _____ clothes from the same factories. (16. We all, dress) _____ in the future? TV shows and movies about the future often (17. show) _____ everybody in a uniform of some kind. What (18. you, think) _____? Number 12