Me pueden ayudar a despejar "x"(x - 1)?
Me pueden ayudar a despejar "x" (x - 1)! + 2(x + 1)! - - - - - - - - - - - - - - - - - - - - = 13 x! - (x - 1)!
Me pueden ayudar a despejar "x" (x - 1)! + 2(x + 1)! - - - - - - - - - - - - - - - - - - - - = 13 x! - (x - 1)!
Pregunta de Matemáticas · 1 respuesta · 1 votos · mejor respuesta de Romero5
En resumen
Factor común (x - 1)! + 2(x + 1)x! = 13 x(x - 1)! - (x - 1)! (x - 1)! + 2(x + 1)(x)(x - 1)! = 13 x(x - 1)! - (x - 1)! (x - 1)! [1 + 2(x + 1)(x)] = 13 x(x - 1)! - (x - 1)! Simplifico(x - 1)!
Factor común (x - 1)!
+ 2(x + 1)x!
= 13 x(x - 1)!
- (x - 1)!
(x - 1)!
+ 2(x + 1)(x)(x - 1)!
= 13 x(x - 1)!
- (x - 1)!
(x - 1)!
[1 + 2(x + 1)(x)] = 13 x(x - 1)!
- (x - 1)!
Simplifico(x - 1)!
1 + 2(x ^ 2 + x) = 13 x - 1
2x ^ 2 + 2x + 1 = 13 x - 1
Tenemos ahora : 2x ^ 2 + 2x + 1 = 13(x - 1) 2x ^ 2 + 2x + 1 = 13x - 13 2x ^ 2 - 11x + 14 = 0 (2x - 7 )(2x - 4) - - - - - - - - - - - - - - - - - - - - = 0 2
(2x - 7)(x - 2) = 0
x = 7 / 2 descartado porque factorial es para enteros positivos
x = 2.
Factor común (x - 1)! + 2(x + 1)x! = 13 x(x - 1)! - (x - 1)! (x - 1)! + 2(x + 1)(x)(x - 1)! = 13 x(x - 1)! - (x - 1)! (x - 1)! [1 + 2(x + 1)(x)] = 13 x(x - 1)! - (x - 1)! Simplifico(x - 1)!