Respuesta :

Answer:

[tex]{ \tt{(f + g)x = ( {x}^{3} - 2 {x}^{2} + 1) + (4 {x}^{3} - 5x + 7)}} \\ \\ { \tt{(f + g)x = ( {x}^{3} + 4 {x}^{3}) + ( - 2 {x}^{2} ) + ( - 5x) + (1 + 7) }} \\ \\ { \boxed{ \rm{(f + g)x = {5x}^{3} - 2 {x}^{2} - 5x + 8 }}}[/tex]

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