Secondary school education math formula
(a-b)✓=a✓-2ab-b✓=(a+b)✓+4ab
a✓-b✓=(a+b) (a-b)
a✓+b✓=(a+b)✓-2ab=(a-b)✓+2ab
=1/2{(a+b)✓+(a-b)✓}
ab =(a+b/2)✓-(a-b/2)✓
4ab =(a+b)✓-(a-b)✓
(a+b+c)✓=(a✓+b✓+c✓+2ab+2bc+2ca
(a✓+b✓+c✓)=(a+b+c)✓-2(ab+bc+ca)
2(ab+bc+ca)=(a+b+c)✓-(a✓+b✓+c✓)
(a+b)3=a3+3a✓b+3ab✓+b3
(a-b)3=a3-3a✓b+3ab✓-b3
a3+b3=(a+b)3-3ab(a+b)=(a+b)(a+ab+b✓)
a3-b3=(a-b)3+3ab(a-b)=(a-ab+b✓)
