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What are the identities of number …

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What are the identities of number syestem

Posted by Shravya Shetty 4 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Prabhjot Kaur 4 years, 9 months ago

1) (a+b)^2 = a^2 + b^2 + 2ab 2) (a-b) ^2 = a^2 + b^2 - 2ab 3) (a^2 - b^2) = (a+b) (a-b) 4) (a+b+c) = a^2 + b^2 + c^2 + 2ab + 2bc + 2ca 5) (a+b)^3 = a^3 + b^3 + 3ab (a+b) 6) (a-b) ^3 = a^3 - b^3 - 3ab (a-b) 7) (a^3 + b^3) = (a+b) (a^2 - ab + b^2) 8) (a^3 - b^3) = (a-b) (a^2 + ab + b^2) 9) (a^3 + b^3 + c^3 - 3abc) = (a+b+c) (a^2 + b^2 + c^2 - ab -bc - ca) 10) (x+a) (x+b) = x^2 + (a+b) x + ab 11) if a + b + c = 0, then a^3 + b^3 + c^3 = 3abc

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