How do you expand $(x-1)^3$ ?

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Answer 1 · 2017-07-25T11:03:42

$x^3-3x^2+3x-1$

$"note that"$

$(x+a)^3=x^3+(a+a+a)x^2+(a.a+a.a+a.a)x+a^3$

$(x-1)^3toa=-1$

$rArr(x-1)^3=x^3+(-1-1-1)x^2+(1+1+1)x+(-1)^3$

$=x^3-3x^2+3x-1$

How do you expand (x-1)^3 (x-1)^3?