3(x+4) - 6x < -9?

2008-02-11 4:22 pm

3(x+4) - 6x < -9

The solution to this inequality is
x > ____?

回答 (4)

2008-02-11 4:26 pm

✔ 最佳答案

3(x+4) - 6x < -9
3x+12-6x<-9
-3x+12<-9
-3x<-21
x>7

The sign switches sides because you divide through by a negative number.

👍 4 👎 2

2008-02-12 12:29 am

3(x + 4) - 6x < -9
3*x + 3*4 - 6x < -9 (* = multiply)
3x + 12 - 6x < -9
3x - 6x < -9 - 12
-3x < -21
x < -21/-3
x > 21/3
x > 7

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2008-02-12 12:33 am

3x + 12 - 6x < - 9
- 3x < - 21
3x > 21
x > 7

👍 1 👎 1

2008-02-12 12:27 am

the answer is 7. tell me if u woud like me to tell u how to work it out

參考: myself

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