Simplify a rational expression

Learn how to simplify rational expressions. A rational expression is an expression in the form of a fraction where the numerator and/or the denominator are/is an algebraic expression. To simplify a rational expression, we factor completely the numerator and the denominator of the rational expression and cancel out terms common to both the numerator and the denominator of the rational expression.
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[alexrodriguezs]

Question, You said that a^3 - b^3 can be rewrited to (a-b)(a^2+ab+b^2), however, in this ecuation wouldn't B= -2?
therefore shouldnt be looking like (x - (-2))(x^2+(-2x)+(-2)^2) = I'm confused :/