Ibbutibbu. one year ago Can someone help me? |9x + 4| - 11 = -4

1. anonymous

First, isolate the absolute value function by adding 11 to both sides. What do you get?

2. hba

Follow those steps: 1) add 11 on both sides 2) subtract 4 on both sides 3) Divide both sides by 9

3. Ibbutibbu.

|9x +15| = -15 ?

4. freckles

@hba that will only give one solution this should give two since we will have |f|=a where a is positive |f|=a means f=a or f=-a

5. anonymous

6. freckles

well 11-4 isn't -15

7. Ibbutibbu.

oh lol i did -11-4 so its actually 7

8. anonymous

Great now you have$\left| 9x+4 \right| = 7$One solution is when the quantity (9x+4) is positive, so solve$9x+4=7$The other solution is when the quantity (9x+4) is negative. So, solve$-\left( 9x+4 \right)=7$Then you'll have the complete solution

9. Ibbutibbu.

so the first one is x = 1/3 and the 2nd one is x = -11/9 ?

10. anonymous

Excellent. Well done!

11. Ibbutibbu.

yay thx

12. anonymous

you're welcome