algebra formula for class 6
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1. (a + b)2 = a2 + 2ab + b2
2. (a - b)2 = a2 - 2ab + b2
3. (a + b) (a - b) = a2 - b2
4. (x + a)(x + b) = x2 + (a + b)x + ab
5. (x + a)(x - b) = x2 + (a - b)x - ab
6. (x - a)(x + b) = x2 + (b - a)x - ab
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