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Find a^3 +b^3 if a+b=12 , …

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Find a^3 +b^3 if a+b=12 , ab=27

Posted by Manjeet Kumar 7 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Vibhor Bansal 7 years, 7 months ago

This question we can done by the identity (a+b)^3 (a+b)^3=a^3+b^3+3ab(a+b) so, we have a+b=12 and ab=27 (12)^3=a^3+b^3+3(27)(12) 1728=a^3+b^+972 1728-972=a^3+b^3 a^3+b^3=756

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CBSE > Class 09 > Mathematics