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anonymous

  • 5 years ago

3|-4x+75|+9=144 HELP

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  1. myininaya
    • 5 years ago
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    3|-4x+75|=199-4 |-4x+75|=195/3 -4x+75=195/3 or -4x+75=-195/3

  2. anonymous
    • 5 years ago
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    Just solve for the absolute value part first, then break it into two different equations.

  3. anonymous
    • 5 years ago
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    Then solve each equation and the solution set is the union of the solutions for each equation.

  4. anonymous
    • 5 years ago
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    but the answer is suppose to be 30.. http://www.wolframalpha.com/input/?i=3 |-4x%2B75|%2B9%3D144 i don't know how they did it though

  5. anonymous
    • 5 years ago
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    LOL ^ LOVE YOU, but that is not the solution... it should be 15/2

  6. myininaya
    • 5 years ago
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    x=-5/2 and 70/2 is what I got let me check

  7. myininaya
    • 5 years ago
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    omg i cant read numbers i did it for 199 not 144 lol

  8. anonymous
    • 5 years ago
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    yeah 15/2 which is... 30

  9. anonymous
    • 5 years ago
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    loll

  10. anonymous
    • 5 years ago
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    how did you solve it though? can you take a picture of your work so i know how you do it?

  11. anonymous
    • 5 years ago
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    \[3|-4x+75| = 144-9\] \[|-4x + 75| = 135/3\] \(-4x + 75 = 135/3 \) or \(-4x + 75 = -135/3 \) \(-4x = 135/3 - 225/3\) or \(-4x = -135/3 -225/3\) \(-4x = -90/3\) or \(-4x = -360/3\) \(x = 30/4\) or \(x = 120/4\) \(x = 7/2\) or \(x = 30\)

  12. anonymous
    • 5 years ago
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    Hrm. I missed something on the left equation.

  13. myininaya
    • 5 years ago
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    x=15/2 or x=30

  14. myininaya
    • 5 years ago
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    you reduced wrong

  15. anonymous
    • 5 years ago
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    Yeah I see.

  16. anonymous
    • 5 years ago
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    \[x = 30/4 = 15/2 \ne 7/2\]

  17. myininaya
    • 5 years ago
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    at least when you read 4s you didn't write 9s and when you read 9s you didn't write 4s

  18. anonymous
    • 5 years ago
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    True ;p

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