expand: (x-1)^3

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asked Jan 3, 2012 in Algebra by anonymous

1 Answer

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First rewrite so its easier to see:  (x-1)(x-1)(x-1)  Now first solve (x-1)(x-1), which is easy right? you get x^2-2x+1.  Now you multiply this by (x-1) again.  First multiply across by x to get x^3-2x^2+x, now multiply across by -1 to get -x^2+2x-1.  Now remember to add up the two parts to get x^3-2x^2+x-1.
answered Jan 3, 2012 by Joey33 ~Expert~ (1,216 points)
selected Jan 3, 2012 by pokemonmaster
good answer.