(a+b)2_a2+2ab+b2
(a-b)2_a2-2ab+b2
(a+b)3_a3+3a2b+3ab2+b3
(a-b)3_a3-3a2b+3ab2-b3
(a+b+c)2_a2+b2+c2+2ab+2bc+2ca
a*x2+2b*x+c=0_x=(-b+sqrt(d))/a:d=b2-ac_x=(-b-sqrt(d))/a:d=b2-ac