Maths Formula

Maths Na Formula
(a+b+c)²= a²+b²+c²+2(ab+bc+ca)
1. (a+b)²= a²+2ab+b²
2. (a+b)²= (a-b)²+4ab
3. (a-b)²= a²-2ab+b²
4. (a-b)²= (a+b)²-4ab
5. a² + b²= (a+b)² - 2ab.
6. a² + b²= (a-b)² + 2ab.
7. a²-b² =(a + b)(a - b)
8. 2(a² + b²) = (a+ b)² + (a - b)²
9. 4ab = (a + b)² -(a-b)²
10. ab ={(a+b)/2}²-{(a-b)/2}²
11. (a + b + c)² = a² + b² + c² + 2(ab + bc + ca)
12. (a + b)³ = a³ + 3a²b + 3ab² + b³
13. (a + b)³ = a³ + b³ + 3ab(a + b)
14. (a-b)³=a³-3a²b+3ab²-b³
15. a³ + b³ = (a + b) (a² -ab + b²)
16. a³ + b³ = (a+ b)³ -3ab(a+ b)
17. a³ -b³ = (a -b) (a² + ab + b²)
18. a³ -b³ = (a-b)³ + 3ab(a-b)
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Posted by Sandip Chaudhari