posted by sandra .
write as a single fraction the simplest form:
3/x + 4/x+1
If you mean (3/x) + (4/x) + 1 , then that equals 7/x + x/x = (7+x)/x
If you mean 3/x + 4/(x+1) , then form a common denominator, and you get
[3(x+1) + 4x]/[x(x+1)]
= (7x+1)/(x^2 + x)
You need to use parentheses and brackets to clarify your ambiguous typed algebraic expressions.