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Expand (x + 1)^3 using an identity.

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Expand (x + 1)3 using an identity.

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(x + 1)3 = (x)3 + (1)3 + 3 (x) (1) (x + 1) 

= x3 + 1 + 3x (x + 1) 

= x3 + 1 + 3x2 + 3x = x3 + 3x2 + 3x + 1

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