Question

if a + b + C is equal to 5 and a b + BC + CA is equal to 10 prove that a cube plus b cube plus c cube minus 3abc is equal to minus 25

Answer 1

Answer:

a^square +b^square +c^square +2(ab +bc+ca)

(5)square +2(10)=a cube plus b cube plus c cube minus 3abc

25+20= -

45=-25

45+25

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