How do you factor by grouping $x^3-x^2-4x+4$ ?

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Answer 1 · 2015-06-10T13:37:02

factor: f(x) = x^3 - x^2 - 4x + 4

f(x) = x^3 - 4x - x^2 + 4

f(x) = x(x^2 - 4) - (x^2 - 4) = (x^2 - 4)(x - 1) = (x - 2)(x + 2)( x - 1)

How do you factor by grouping x^3-x^2-4x+4x^3-x^2-4x+4?