MATHEMATICAL FORMULAE(Expansion Formulae)

MATHEMATICAL FORMULAE

Algebra

1. Expansion Formulae

(x + y)2 = x2 + 2xy + y2
(x - y)2 = x2 - 2xy + y2
x2 - y2 = (x - y) (x + y)
(x + y)3 = x3 + 3x2y + 3xy2 + y3
x3 + y3 = (x + y) (x2 - xy + y2)
(x - y)3 = x3 - 3x2y + 3xy2 - y3
x3 - y3 = (x - y) (x2 + xy + y2)

2. Quadratic Equation

If ax2 + bx + c = 0,