Help again! @jim_thompson5910
Solve the equation \[\frac{ 1 }{ 3x+9 } - \frac{ 2 }{ x+3 }=2\]
Answer choices: A. X=1 B. x=\[\frac{ -23 }{ 6 }\] C. x=\[\frac{ -5 }{ 2 }\] D. x=-5
\[\large \frac{ 1 }{ 3x+9 } - \frac{ 2 }{ x+3 }=2\] \[\large \frac{ 1 }{ 3(x+3) } - \frac{ 2 }{ x+3 }=2\] \[\large \frac{ 1 }{ 3(x+3) } - \frac{ 3*2 }{ 3(x+3) }=2\] \[\large \frac{ 1 }{ 3(x+3) } - \frac{ 6 }{ 3(x+3) }=2\] I'll let you finish
you can't subtract unless the denominators are the same
OK. So it would be -5 or D! Thanks again. @jim_thompson5910
no
I'll finish up
\[\large \frac{ 1 }{ 3(x+3) } - \frac{ 6 }{ 3(x+3) }=2\] \[\large \frac{ 1 - 6 }{ 3(x+3) }=2\] \[\large \frac{ -5 }{ 3(x+3) }=2\] \[\large -5 =2*3(x+3)\] \[\large -5 =6x+18\] \[\large -5-18 =6x\] \[\large -23 =6x\] \[\large x = -\frac{23}{6}\]
That could have been bad! Thank you!
np
make sure you check any/all answers you get because sometimes with rational equations, possible solutions aren't really solutions at all
in this case, x = -23/6 is actually a solution, but checking is always good
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