( x + 2 )² = x² + 4 x + 4
( x - 3 )² = x² - 6 x + 9
( x - 3 ) 2 = 2 x - 6
( - x³ + 1 )²= x⁶ - 2 x³ + 1
( - a - 2 )² = a² + 4 a + 4
( 1 - 2 x )² = 1 - 4 x + 4 x²
( a²- 3 b) ² = a⁴ - 6 a² b + 9 b²
( 2 a - 3 b )² = 4 a² - 12 a b + 9 b²
( 3 x + 4 y )² = 9 x² + 24 x y + 16 y²