solve this question which are circle in this picture
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15.
let x^3+x^2+x+1=0.
now grouping x^3 and x^2 seperately and x and 1 seperately.
x^2(x+1)+1(x+1)=0
(x^2+1)+(x+1)=0
hence proved
let x^3+x^2+x+1=0.
now grouping x^3 and x^2 seperately and x and 1 seperately.
x^2(x+1)+1(x+1)=0
(x^2+1)+(x+1)=0
hence proved
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