anonymous
  • anonymous
|x+5|=3x-7 solve
Mathematics
jamiebookeater
  • jamiebookeater
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allank
  • allank
Hint: If |a|=b then a=b a=-b
allank
  • allank
Can you take it from there @jigglyjello ?
anonymous
  • anonymous
x+5 = 3x-7 x=6 OR x+5 = -3x+7 x=0.5

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Zarkon
  • Zarkon
just 6
anonymous
  • anonymous
ok thank you
anonymous
  • anonymous
@Zarkon why is it just 6 ?
Zarkon
  • Zarkon
plug in .5 into the above equation...does it work...
anonymous
  • anonymous
@Zarkon but what's the flaw in the logic behind just doing\[|x|=a\implies x=a\vee x=-a;~~a\ge0\]
Zarkon
  • Zarkon
and what happens when \(a<0\)
anonymous
  • anonymous
oh! I see, it is a<0 for the other soln! Hail Zarkon!

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