Question

Resolva:

a) (3×+4y)^3

me ajudem por favor...❤​

Answer 1

$(3x + 4y) {}^{3} = \\ (3x + 4y) (3x + 4y) (3x + 4y) = \\ (9 {x}^{2} + 12xy + 12xy + 16y{}^{2})(3x + 4y) = \\ (9 {x}^{2} + 24xy + 16{y}^{2})(3x + 4y) = \\ 27 {x}^{3} + 36 {x}^{2} y + 72 {x}^{2} y + 96 {y}^{2} x + 48xy{}^{2} + 64 {y}^{3} = \\ 27 {x}^{3} + 108 {x}^{2} y + 144 {y}^{2} x + 64 {y}^{3}$