The problem
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If we use the sum of two cubes rule why is the step (a + b) (a^ - ab + b^2) and not (a + b) (a^2 + ab + b^2)?
Answer provided by our tutors
Factoring the two cubes yielded in both the terms you are citing: (a + b) (a^2 - ab + b^2) and (a + b) (a^2 + ab + b^2)
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