Factor by grouping: 25(a-3)^3 - 4(a-3)

1 answer:

6 0

25(a-3)³ - 4(a-3) = (a-3)(25(a-3)²-4) = (a-3)((5(a-3))²-2²) =
= (a-3)(5(a-3)-2)(5(a-3)+2) = (a-3)(5a-15-2)(5a-15+2) = (a-3)(5a-17)(5a-13)

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