Question

$(5x - 4y) {}^{3} - (3x + 2y)(y - 5x)$
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Answer 1

$(5x - 4y) {}^{3} - (3x + 2y)(y - 5x) = 125x {}^{3} - 300 {x}^{2} y + 240x {y}^{2} - 64 {y}^{3} - (3xy - 15 {x}^{2} + 2 {y}^{2} - 10xy) = \\ = 125x {}^{3} - 300 {x}^{2} y + 240x {y}^{2} - 64 {y}^{3} - 3xy + 15 {x}^{2} - 2 {y}^{2} + 10xy = 125x {}^{3} - 300 {x}^{2} y + 240x {y}^{2} - 64 {y}^{3} + 7xy + 15 {x}^{2} - 2 {y}^{2}$