2. (a-b)2=a2-2ab+b2
3. a2+b2= (a+b)2-2ab
4. a2+b2=(a-b)2+2ab
5. a2-b2=(a+b)(a-b)
6. a2+b2= 1/2{(a+b)2+(a-b)2}
7. ab=(a+b/2)2-(a-b/2)2
8. 4ab=(a+b)2-(a-b)2
9. (a+b)2=(a-b)2+4ab
10. (a-b)2=(a+b)2-4ab
11.(a+b)2+(a-b)2=2(a2+b2)
12. (a+b+c)2= a2+b2+c2+2ab+2bc+2ca
13. 2(ab+bc+ca)=(a+b+c)2-(a2+b2+c2)
14. a2+b2+c2=(a+b+c)2-2(ab+bc+ca)
15. (x+a)(x+b)=x2+(a+b)x+ab
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