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( b² + ab - 3a² ) - ( a² - ab - b² ) = -4a² + 2ab
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2).
p = x² - 3x - 2
l = 3x² + 2x - 4
4p - q = 4 ( x² - 3x - 2 ) - ( 3x² + 2x - 4 )
= ( 4x² - 12x - 8 ) - ( 3x² + 2x - 4 )
= x² - 14x - 4