Example

Factoring 20x2−16x−15x+1220x^2 - 16x - 15x + 12

Factor the polynomial 20x2−16x−15x+1220x^2 - 16x - 15x + 12 using the grouping method. There is no overall GCF, so split the polynomial into two groups: (20x2−16x)(20x^2 - 16x) and (−15x+12)(-15x + 12). Extract the GCF from the first group, which is 4x4x, to get 4x(5x−4)4x(5x - 4). For the second group, factor out −3-3 to reverse the signs and match the binomial from the first group: −3(5x−4)-3(5x - 4). The expression is now 4x(5x−4)−3(5x−4)4x(5x - 4) - 3(5x - 4). Both parts contain the common binomial factor (5x−4)(5x - 4). Factoring this out yields the final result: (5x−4)(4x−3)(5x - 4)(4x - 3). Check by multiplying the binomials to ensure they reproduce the original four-term polynomial.

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Updated 2026-06-03

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