Your questions have gone unanswered because it's pretty clear you have made no attempt on your own.
Once you have shown your work so far, even if it's incomplete, you'll be more likely to get good responses.
3x/x+1=12/xx-1+2
3 answers
i have 3x/x+1=12/x^2-1+2
ans. 3x/x+1=14/x^2-1
3/1=14/x^-1
14/3x^2-1=14/2x^2
x=7/1
this is the answer that i have
ans. 3x/x+1=14/x^2-1
3/1=14/x^-1
14/3x^2-1=14/2x^2
x=7/1
this is the answer that i have
You need to combine like terms. Numerals cannot be combined with X terms.
3x/x+1=12/x^2-1+2
x/x cancel each other out.
3 + 1 = 12/x^2 + 1
Subtract 1 from each side.
3 = 12/x^2
Multiply both sides by x^2.
3x^2 = 12
Divide both sides by 3.
x^2 = 4
x = 2
Possibly these sources might help:
http://www.algebrahelp.com/lessons/simplifying/oops/
http://northpark.edu/math/PreCalculus/rules.html
http://mathforum.org/dr.math/faq/faq.order.operations.html
Use the same principles in your other problems. I hope this helps. Thanks for asking.
3x/x+1=12/x^2-1+2
x/x cancel each other out.
3 + 1 = 12/x^2 + 1
Subtract 1 from each side.
3 = 12/x^2
Multiply both sides by x^2.
3x^2 = 12
Divide both sides by 3.
x^2 = 4
x = 2
Possibly these sources might help:
http://www.algebrahelp.com/lessons/simplifying/oops/
http://northpark.edu/math/PreCalculus/rules.html
http://mathforum.org/dr.math/faq/faq.order.operations.html
Use the same principles in your other problems. I hope this helps. Thanks for asking.