Jawaban:
[tex] {(a - b)}^{3} \\ = (a - b) (a - b) {}^{2} \\ = (a - b)( {a}^{2} - 2ab + {b}^{2} ) \\ = {a}^{3} - 2 {a}^{2} b + a {b}^{2} - {a}^{2} b + 2a {b}^{2} - {b}^{3} \\ = {a}^{3} - 3 {a}^{2} b + 3a {b}^{2} - {b}^{3} [/tex]
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Jawaban:
[tex] {(a - b)}^{3} \\ = (a - b) (a - b) {}^{2} \\ = (a - b)( {a}^{2} - 2ab + {b}^{2} ) \\ = {a}^{3} - 2 {a}^{2} b + a {b}^{2} - {a}^{2} b + 2a {b}^{2} - {b}^{3} \\ = {a}^{3} - 3 {a}^{2} b + 3a {b}^{2} - {b}^{3} [/tex]