describe the error made in subtracting the two rational expressions shown:; which expression is equivalent to 3x − 4y5 − 2; what is the sum 2/x^2+4/x^2; which expression is equivalent to the following complex fraction 2 x 4/y 3/x; what is the sum 3 x^2-9 + 5/x+3; explain the steps involved in adding two rational expressions.; which expression is equivalent to the following complex fraction 3/x-1; what is the sum x/x+3+3/x+3+2/x+3