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Verified answer
1) ( x + 4)( x - 4 )= ( x + 4 )x + ( x + 4)( - 4 )
= x² + 4x - 4x - 16
= x² - 16
2) ( 2p + 2) ( 2p + 2)
= ( 2p + 2)( 2p ) + ( 2p + 2)( 2)
= 4p² + 4p + 4p + 4
= 4p² + 8p + 4
3) ( 3x - 2 )( 3x - 2)
= ( 3x - 2)( 3x ) + ( 3x - 2)( - 2)
= 9x² - 6x - 6x + 4
= 9x² - 12x + 4