(х+2)(х^2 +2х+4)-х(х-3)(х+3)=26

Question

(х+2)(х^2 +2х+4)-х(х-3)(х+3)=26

Answer 1

X^3+2x^2+4x+2x^2+4x+8-x^3-9x=26
4x^2-x-18=0
D=1+4*18*4=289
x12=(1±17)/8
x1=2.25
x2= -2