Respuesta:
[tex] {(x + y)}^{7} = {x}^{7} + {7x}^{6} y + {21x}^{5} {y}^{2} + {35x}^{4} {y}^{3} + {35x}^{3} {y}^{4} + {21x}^{2} {y}^{5} + {7xy}^{6} + {y}^{7} [/tex]
[tex] {( {3x}^{2} + {4y}^{5}) }^{4} = {81x}^{8} + {432x}^{6} {y}^{5} + {864x}^{4} {y}^{10} + {768x}^{2} {y}^{15} + {256y}^{20} [/tex]
