(х+1)(х^2-х+1)-х(х^2+9)=10 (х+1)(х^2-х+1)=10+х(х^2+9) (х+1)(х^2-х+1)=10+х^3 +9х х^3-х^2+x+x^2-x+1-10-x^3-9x=0 -9x-9=0 9х+9=0 9х=-9 х=-1