[tex] {(s + t)}^{3} = (s + t) {(s + t)}^{2} = (s + t)( {s}^{2} + 2st + {t}^{2} ) = \\ \\ = s \times ( {s}^{2} + 2st + {t}^{2} ) + t \times ( {s}^{2} + 2st + {t}^{2} )[/tex]
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[tex] {(s + t)}^{3} = (s + t) {(s + t)}^{2} = (s + t)( {s}^{2} + 2st + {t}^{2} ) = \\ \\ = s \times ( {s}^{2} + 2st + {t}^{2} ) + t \times ( {s}^{2} + 2st + {t}^{2} )[/tex]