(a+b)^3 how to solve this identity
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To find the cube of a binomial, we will just multiply (a + b)(a + b)(a + b). (a + b)3 formula is also an identity. It holds true for every value of a and b.The (a + b)3 is given as,
(a + b)3 = (a + b)(a + b)(a + b)
= (a2 + 2ab + b2)(a + b)
= a3 + a2b + 2a2b + 2ab2 + ab2 + b3
= a3 + 3a2b + 3ab2 + b3
= a3 + 3ab(a+b) + b3
Therefore, (a + b)^3 formula is:
(a + b)3 = a3 + 3a2b + 3ab2 + b3
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