Question

Please. Help me for solving this with full solution plz plz pl

Answer 1

a+b+c=1
ab+bc+ca=-1
abc=1
a^2+b^2+c^2=(a+b+c)^2-2(ab+bc+ca)
=1+2=3
a^3+b^3+c^3=3abc+(a^2+b^2+c^2-ab-bc-ca)(a+b+c)
=3×1+(3+1)1
=3+4=7



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