Question

(3x -7y) ^3 + (3x + 7y) ​

Answer 1

Step-by-step explanation:

$(3x - 7y)(3x7y)(3x - 7y)(3x−7y)(3x7y)(3x−7y)</p><p>= (9 {x}^{2} - 21xy - 21xy + 49 {y}^{2} )(3x -7y)=(9x2−21xy−21xy+49y2(3x−7y)</p><p>= 18 {x}^{3} - 63 {x}^{2} y - 63 {x}^{2} y + 147x {y}^{2} - 63 {x}^{2} y + 147x {y}^{2} + 14 + x {y}^{2} - 343 {y}^{2}=18x3−63x2y−63x2y+147xy2−63x2y+147xy2+14+xy2−343y2= 18 {x}^{2} - 189 {x}^{2} y + 441x {y}^{2} - 343 {y}^{2}=18x2−189x2y+441xy2−343y2$