Question

$(5m - 2n) {3}^{ }$

Answer 1

$(5m - 2n) {}^{3 } = (5m - 2n)(5m - 2n)(5m - 2n) \\ = (25 {m}^{2} - 20mn + 4 {n}^{2} )(5m - 2n) \\ = 75 {m}^{3} - 50 {m}^{2} n - 100 {m}^{2} n + 40m {n}^{2} + 20m {n}^{2} - 8 {n}^{3} \\ 75 {m}^{3} - 150 {m}^{2} n + 60m {n}^{2} - 8 {n}^{3}$