Ibbutibbu.
  • Ibbutibbu.
Can someone help me? |9x + 4| - 11 = -4
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
First, isolate the absolute value function by adding 11 to both sides. What do you get?
hba
  • hba
Follow those steps: 1) add 11 on both sides 2) subtract 4 on both sides 3) Divide both sides by 9
Ibbutibbu.
  • Ibbutibbu.
|9x +15| = -15 ?

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freckles
  • 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
anonymous
  • anonymous
Add 11, not subtract
freckles
  • freckles
well 11-4 isn't -15
Ibbutibbu.
  • Ibbutibbu.
oh lol i did -11-4 so its actually 7
anonymous
  • 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
Ibbutibbu.
  • Ibbutibbu.
so the first one is x = 1/3 and the 2nd one is x = -11/9 ?
anonymous
  • anonymous
Excellent. Well done!
Ibbutibbu.
  • Ibbutibbu.
yay thx
anonymous
  • anonymous
you're welcome

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