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Factor $\displaystyle 4x^3+4x^2-x-1$

Quote: Originally Posted by william Factor $\displaystyle 4x^3+4x^2-x-1$ Use Grouping 2 and 2. $\displaystyle 4x^3 + 4x^2 - x - 1 = 4x^2(x + 1) - (x + 1) = (x + 1)(4x^2 - 1) = (x + 1)(2x + 1)(2x - 1)$ (the last one is found using DOTS).