LEARN TESTS

Basic Algebraic Formulas

05 min read

1. (1 + 2 + 3 + … + n) = n(n + 1)/2
2. (12 + 22 + …. + n2) = [n(n + 1) (2n + 1)]/6
3. (13 + 23 + …. + n3) = [n2(n + 1)2]/4
4. (a + b)2 = a2 + b2 + 2ab
5. (a – b)2 = a2 – 2ab + b2
6. (a + b) (a – b) = a2 – b2
7. (a + b)3 = a3 + 3a2b + 3ab2 + b3
8. (a – b)3 = a3 – 3a2b + 3ab2 – b3
9. (a + b) (a2 – ab + b2) = a3 + b3
10. (a – b) ( a2 + ab + b2 ) = a3 – b3
11. (a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca


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