Example

Factoring (x+5)364x3(x + 5)^3 - 64x^3

The binomial (x+5)364x3(x + 5)^3 - 64x^3 is a difference of two cubes, where the first term is (x+5)3(x + 5)^3 and the second term is 64x3=(4x)364x^3 = (4x)^3. Using the difference of cubes pattern a3b3=(ab)(a2+ab+b2)a^3 - b^3 = (a - b)(a^2 + ab + b^2) with a=(x+5)a = (x + 5) and b=4xb = 4x, the factored form is ((x+5)4x)((x+5)2+(x+5)(4x)+(4x)2)((x + 5) - 4x)((x + 5)^2 + (x + 5)(4x) + (4x)^2). To simplify, combine like terms in the first binomial to get (3x+5)(-3x + 5). Expand the trinomial part to (x2+10x+25)+(4x2+20x)+16x2(x^2 + 10x + 25) + (4x^2 + 20x) + 16x^2, which simplifies to 21x2+30x+2521x^2 + 30x + 25. The final factored expression is (3x+5)(21x2+30x+25)(-3x + 5)(21x^2 + 30x + 25).

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Updated 2026-04-30

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