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If a+b+c=5 and ab +bc+ca=10 then prove that a3 + b3+c3-3abc

Posted by Manish Tomar 8 years, 6 months ago

CBSE > Class 09 > Mathematics

2 answers

Rishabh Mehta 9A 4 years, 10 months ago

Putting the value given in the question we get, (5) 3 =(a 3 +b 3 +c 3 )+3(5)(10)−3abc =>(a 3 +b 3 +c 3 )−3abc=(5) 3 −3(5)(10) =>(a 3 +b 3 +c 3 )−3abc=125−150 =>(a 3 +b 3 +c 3 )−3abc=−25

1Thank You

Gourja Soni 4 years, 10 months ago

answer plz

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