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6x - 14 = 2 (2x-10) + 2l
6x - 14 = 4x - 20 + 2l
6x - 4x - 14 + 20 = 2l
2x + 6 = 2l
l = ( 2x + 6 ) / 2
= x + 3
L = p . l
= ( 2x - 10 ) . ( x + 3 )
= 2x² + 6x - 10x - 30
= 2x² - 4x - 30