Use factoring to help us determine the LCD when subtracting two rational expressions

The video tutorial explains how to determine the least common denominator (LCD) in algebraic expressions. It emphasizes the importance of factoring trinomials to simplify expressions before adding or subtracting. The tutorial demonstrates how to factor a trinomial and use the factored form to find the LCD. It also covers the process of simplifying expressions by rewriting them as addition problems and combining terms. The tutorial concludes with a final expression where the LCD is used to simplify the equation.

How can you rewrite the expression X^2 + 3X - 10 in factored form?

What is the significance of having a common denominator when adding or subtracting fractions?