( x + y )² = x² + 2xy + y²
( 2x + 1 )² = 4x² + 4x + 1
( 6 - a )² = 36 - 12a + a²
( 1 - a )² = 1 - 2a + a²
( 1/2 + x )² = 1/4 + x² - x
( x + y )² = x² + 2xy + y²
( 2x + 1 )² = 4x² + 4x + 1
( 6 - a )² = 36 - 12a + a²
( 1 - a )² = 1 - 2a + a²
( 1/2 + x )² = 1/4 + x² - x