please show the correct solution:
problem:
3x-2(x+1)=2x
3x-2x+2=2x
x+2=2x
x=2
2007-09-13 12:59:09 · 3 answers · asked by ALESANA 7 in Science & Mathematics ➔ Mathematics
since it multiplies first, both things in the brackets should be minus.
as such:
3x-2(x+1)=2x
3x-2x-2=2x
x-2=2x
-2=x
x= -2
2007-09-13 13:08:12 · answer #1 · answered by Steve 7 · 1⤊ 0⤋
3x - 2(x + 1) = 2x
3x - 2x - 2 = 2x
x - 2 = 2x
- 2 = x
x = -2
2007-09-13 13:07:34 · answer #2 · answered by Anonymous · 0⤊ 0⤋
yeah
3x-2(x+1)=2x
3x - (2x+2)=2x
which is really
3x+(-1)(2x+2)=2x
I'm sure you feel silly for over looking that now.
You know you can check your work by doing the problem different next time. Usually you can see if you make silly mistakes when you use compare solutions... all the number should be simular(meanning positive and negative)
or number should be reversed when they are on the otherside
Ex (different way of doing the problem)
3x-2(x+1)=2x
-2(x+1)=2x-3x
here when you compare the two solutions you have a chance to see that you weren't using -2(x-1) in your other solution... and you can try figure out which solution is incorrect.
-2(x+1)= -1x
-2x-2= -1x
-2= -x+2x
-2=x
2007-09-13 13:23:56 · answer #3 · answered by Di 2 · 0⤊ 0⤋