🇪🇸 Suponga que:
(x 3)(x 5)(x 7)(x 9) = 9
Dado que 3,5,7,9 son impares consecutivos, se considera el promedio de los términos libres:
(3 5 7 9) /4 = 24/4 = 6
Luego:
x = - 6 es solución factible.
Combinaciones que dan 9
( -3 )( -1 )( 1 )( 3 ) = 9
Luego:
Si x 3 = -3
x = - 6
Si x 5 = - 1
x = - 6
Si x 7 = 1
x = - 6
Si x 9 = 3
x = - 6
Por tanto, ( - 6 ) es solución consistente.
Reemplazando:
(-6 3)(-6 5)(-6 7)(-6 9) = 9
Luego x = - 6 cumple.
Por simetría, el polinomio tiene 4 raíces de las cuales dos son reales e iguales que equivalen a ( - 6)
Por tanto las otras dos raíces son reales distintas pero no enteras, por no haber enteros que multipliquen 9, diferentes a la combinación dada de 4 factores.
Luego al menos dos raíces son ( - 6 )
Las otras dos raíces, se pueden encontrar por las propiedades de los polinomios o gráficamente bajando dos grados, dado que conocemos dos raíces.
🇺🇸 Suppose that:
(x 3)(x 5)(x 7)(x 9) = 9
Since 3, 5, 7, and 9 are consecutive odd numbers, we consider the average of the constant terms:
(3 5 7 9) / 4 = 24 / 4 = 6
Therefore:
x = -6 is a feasible solution.
Combinations that give 9:
(-3)(-1)(1)(3) = 9
Therefore:
If x 3 = -3
x = -6
If x 5 = -1
x = -6
If x 7 = 1
x = -6
If x 9 = 3
x = -6
Therefore, (-6) is a consistent solution.
Substituting:
(-6 3)(-6 5)(-6 7)(-6 9) = 9. Therefore, x = -6 satisfies the condition.
By symmetry, the polynomial has 4 roots, two of which are real and equal, equivalent to -6.
Therefore, the other two roots are distinct real roots, but not integers, since there are no integers that multiply 9 other than the given combination of 4 factors. Thus, at least two roots are -6.
The other two roots can be found using the properties of polynomials or graphically by descending two degrees, given that we know two roots.