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( x + ____________________ ) ² = ____________________ + ____________________ + 9
( 2a + ____________________ ) ² = ____________________ + 4a + ____________________
( - ____________________ + 8 ) ² = x² ? 16x + ____________________
( ____________________ - 4 ) ² = ____________________ - 8x + ____________________
( ____________________ - x ) ( ____________________ + x ) = 25 - ____________________
( - m - ____________________ ) ( - m + ____________________ ) = ____________________ - a²b ²