Question

E=(X+3)(X^2-3X+9)+(X^2+3X+9)(X-3)

Answer 1

Respuesta:

$(x + 3)( {x}^{2} - 3x + 9) + ( {x}^{2} + 3x + 9)(x - 3)$

Usando:

$(a + b)( {a}^{2} - ab + {b}^{2} ) = {a}^{3} + {b}^{3}$

${x}^{3} + 27 + {x}^{3} - 27 \\ {x}^{3} + {x}^{3} \\ 2 {x}^{3}$