Question

( x + 3 ) ( x^2 -3 x + 9) = 91​

Answer 1

Hola! :3

Resolvemos:

(x + 3)(x² - 3x + 9) = 91

x(x²) + x(-3x) + x(9) + 3(x²) + 3(-3x) + 3(9) = 91

x³ - 3x² + 9x + 3x² - 9x + 27 = 91

Simplificando términos semejantes:

x³ + (-3 + 3)x² + (9 - 9)x + 27 = 91

x³ + 0x² + 0x + 27 = 91

x³ + 27 = 91

x³ = 91 - 27

x³ = 64

x = ³√64

x = 4

Espero haberte ayudado :D

Atte: Jean07122006