math
posted by Robert on .
Solve this :
(8x^3 )  (168x^2) + ( 864x) = 1120
please >>>>>>>>>> I need it >>> please

(8x^3 )  (168x^2) + ( 864x) = 1120 divide by 8
(x^3 )  (21x^2) + ( 108x)  140 = 0
I tried x = 2 and it worked, so x2 is a factor
using synthetic division I founs
(x2)(x^2 19x + 70) = 0
(x2)(x14)(x5)=0
so x 2, x = 14, or x = 5