Algebra
A branch of mathematics which deals with calculations using letters and symbols.
Main points to remember
( x + y) a = xa + ya
( x + y) ( u + v ) = xu + xv + yu + yv
( x + y) 2 (whole square) = x 2 + 2xy + y 2
( x - y )2 (whole square) = x 2 - 2xy + y 2
( x + y ) ( x - y) = x 2 - y 2
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