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Subject: Math , asked on 7/10/12

# what is formula of a3+b3

a3+b3 = (a+b)3-3ab(a+b)

• 362

please explain how a3+b3= (a+b)(a2-ab+b2)  and

a3-b3= (a-b)(a2+ab+b2

• 257

a3+b3= (a+b)(a2+b2-ab)

• 180
Certified by MeritNation Expert

a3+b3=(a+b)(a2+b2-ab)

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• 149

3a+3b+3ab(a+b)

• 117

a3 - b = (a-b) (a 2 +ab+b2)     (multiply these to expression)

=a3+a2b+ab2-a 2 b+ab2-b3  (+a2b-a 2 b=0  +ab2+ab2= 0  )

=a3-b3

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a^3+b^3=(a+b)(a^2-ab+b^2)

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• HERE IS D ANS GIVEN BY MERITNATION EXPERT...!!!
• a3+b3 = (a+b)3-3ab(a+b) >>>This one is the formula for Expanding only...

a3-b3 = (a-b)3+3ab(a+b)

AND

a3+b3 = (a+b) (a2-ab+b2) >>>This is the formula for FACTORISING....

a3+b3 = (a-b) (a2+ab+b2)

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a3+b3+3ab(a+b)

• -17

(a+b) ( a2 - ab - b2)

• -31

a3+b3=(a+b)(a2-ab+b2)

• -38

please explain in brief of formula a3+b3 and a3-b3

• -40

plzzz ans. this ques.

• -49

a3 + b3 = (a+b) (a2+ b2 -ab)

• -82

can u tell me d ans in terms of alpha and beta..

• -180