Algebra- Expansion

 

Distributive law:

a ( b + c ) = ab + ac

 

Binomial products:

( a + b ) ( c + d ) = ac + ad + bc +bd

 

Perfect square rules:

( a + b ) ²  =  a² + 2ab + b²

( a — b ) ²  =  a² — 2ab + b²

 

Difference of two squares rule:

( a + b ) ( a —b )  =  a² — b²

 

 

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