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| Summary |
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 (a + b)2 = a2 + 2ab + b2 |
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| (a - b)2 = a2 - 2ab + b2 |
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In the above two formulae |
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the middle term =  |
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(a + b) (a - b) = a2 - b2 |
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(x + a) (x + b) = x2 + (a + b)x + ab. |
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(a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ac |
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(a + b)3 = a3 + b3 + 3ab (a + b) = a3 + 3a2b + 3ab2 + b3 |
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| (a - b)3 = a3 - b3 - 3ab (a - b) = a3 - 3a2b + 3ab2 - b3 |
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