Solved: In Exercises 14, prove the algebraic identity by
Chapter 5, Problem 5.1.1.120(choose chapter or problem)
In Exercises 1–4, prove the algebraic identity by starting with the LHS expression and supplying a sequence of equivalent expressions that ends with the RHS expression.
(x - 1)(x + 2) - (x + 1)(x - 2) = 2x
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