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Ibbutibbu.

  • one year ago

Can someone help me? |9x + 4| - 11 = -4

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  1. anonymous
    • one year ago
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    First, isolate the absolute value function by adding 11 to both sides. What do you get?

  2. hba
    • one year ago
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    Follow those steps: 1) add 11 on both sides 2) subtract 4 on both sides 3) Divide both sides by 9

  3. Ibbutibbu.
    • one year ago
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    |9x +15| = -15 ?

  4. freckles
    • one year ago
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    @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
    • one year ago
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    Add 11, not subtract

  6. freckles
    • one year ago
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    well 11-4 isn't -15

  7. Ibbutibbu.
    • one year ago
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    oh lol i did -11-4 so its actually 7

  8. anonymous
    • one year ago
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    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.
    • one year ago
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    so the first one is x = 1/3 and the 2nd one is x = -11/9 ?

  10. anonymous
    • one year ago
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    Excellent. Well done!

  11. Ibbutibbu.
    • one year ago
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    yay thx

  12. anonymous
    • one year ago
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    you're welcome

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