( a + b ) ( a - b )
a ( a - b ) + b ( a - b )
a² - ab + ab - b²
a² - 0 - b²
a² - b²
_____________________
(a+b)(a+b)
a ( a + b ) + b ( a + b )
a² + ab + ab + b²
a² + 2ab + b²
( 2a + b )²
( 2a + b ) ( 2a + b )
2a ( 2a + b ) + b ( 2a + b )
4a² + 2ab + 2ab + b²
4a² + 4ab + b²
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( a + b ) ( a - b )
a ( a - b ) + b ( a - b )
a² - ab + ab - b²
a² - 0 - b²
a² - b²
_____________________
(a+b)(a+b)
a ( a + b ) + b ( a + b )
a² + ab + ab + b²
a² + 2ab + b²
______________
( 2a + b )²
( 2a + b ) ( 2a + b )
2a ( 2a + b ) + b ( 2a + b )
4a² + 2ab + 2ab + b²
4a² + 4ab + b²