anonymous
  • anonymous
3|-4x+75|+9=144 HELP
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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myininaya
  • myininaya
3|-4x+75|=199-4 |-4x+75|=195/3 -4x+75=195/3 or -4x+75=-195/3
anonymous
  • anonymous
Just solve for the absolute value part first, then break it into two different equations.
anonymous
  • anonymous
Then solve each equation and the solution set is the union of the solutions for each equation.

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anonymous
  • anonymous
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
anonymous
  • anonymous
LOL ^ LOVE YOU, but that is not the solution... it should be 15/2
myininaya
  • myininaya
x=-5/2 and 70/2 is what I got let me check
myininaya
  • myininaya
omg i cant read numbers i did it for 199 not 144 lol
anonymous
  • anonymous
yeah 15/2 which is... 30
anonymous
  • anonymous
loll
anonymous
  • anonymous
how did you solve it though? can you take a picture of your work so i know how you do it?
anonymous
  • anonymous
\[3|-4x+75| = 144-9\] \[|-4x + 75| = 135/3\] \(-4x + 75 = 135/3 \) 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 \(x = 30\)
anonymous
  • anonymous
Hrm. I missed something on the left equation.
myininaya
  • myininaya
x=15/2 or x=30
myininaya
  • myininaya
you reduced wrong
anonymous
  • anonymous
Yeah I see.
anonymous
  • anonymous
\[x = 30/4 = 15/2 \ne 7/2\]
myininaya
  • myininaya
at least when you read 4s you didn't write 9s and when you read 9s you didn't write 4s
anonymous
  • anonymous
True ;p

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