Subtract two rational expressions by obtaining common denominators

The video tutorial covers the process of finding common denominators in addition and subtraction, focusing on both numbers and polynomials. It explains that for polynomials, the common denominator is the product of the denominators. The tutorial also demonstrates the use of FOIL and the distributive property in polynomial multiplication, leading to the final answer and constraints.

What is the final answer after combining like terms in the expression?

What are the constraints for the variable X in the given problem?