Math2.org Math Tables: Polynomial Identities
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(a+b)2 = a2 + 2ab + b2
(a+b)(c+d) = ac + ad + bc + bd
a2 - b2 = (a+b)(a-b) (Difference of squares)
a3 
b3 = (a b)(a2
ab + b2) (Sum and Difference of Cubes)
x 2 + (a+b)x + ab = (x + a)(x + b)
if ax2 + bx + c = 0 then x = ( -b ![[sqrt]](/math//symbols/sqrt.gif "[sqrt]")
(b2 - 4ac) ) / 2a (Quadratic Formula)
