Basically, trying to factorize (a-2)^3 - (a+1)^3, the workbook unit's about using the sum and difference of 2 cubes.

Any help would be appreciated :)

Btw, the answer was -9(a^2 - a + 1)

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- Feb 6th 2013, 08:37 PMRazbazDon't understand how to factorize this
Basically, trying to factorize (a-2)^3 - (a+1)^3, the workbook unit's about using the sum and difference of 2 cubes.

Any help would be appreciated :)

Btw, the answer was -9(a^2 - a + 1) - Feb 6th 2013, 09:05 PMchiroRe: Don't understand how to factorize this
Hey Razbaz.

The difference of two cubes formula is x^3 - y^3 = (x-y)(x^2 + xy + y^2). (Hint let x = a - 2 and guess what y should be).