anonymous
  • anonymous
|(7x+21)/3|=7 Solve the absolute value equation
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
|dw:1328144783679:dw|
anonymous
  • anonymous
|dw:1328144832974:dw|
anonymous
  • anonymous
so here you solve simultaneously the following: (7x + 21)/3 = 7 (-7x -21)/ -3 = 7 <-- not too sure as to whether that should be /-3 or /3. then you can solve them!

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saifoo.khan
  • saifoo.khan
\[|\frac{7x+21}{3}| = 7\]Rewrite, \(\frac{7x+21}{3} = 7\) And \(\frac{7x+21}{3} =-7\) Solve both.
anonymous
  • anonymous
So it ends up being -6,0 ?
anonymous
  • anonymous
Aren't you supposed to flip the signs of the modulus bit, not the result? as the modulus signs mean the answer could have originally been + or -?
anonymous
  • anonymous
I don't know i'm afraid, like I said, I'm not too sure myself. The concept is there though...
anonymous
  • anonymous
Ok. Thank-you

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