bjr
(3x-2)(8x+1)-(8x+1)(5x+6)
= 3x*8x + 3x*1 - 2*8x - 2*1 - (8x*5x + 8x*6 + 1*5x + 1*6)
= 24x² + 3x - 16x - 2 - (40x² + 48x + 5x + 6)
= 24x² - 13x - 2 - 40x² - 53x - 6
= -16x² - 66x - 8
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bjr
(3x-2)(8x+1)-(8x+1)(5x+6)
= 3x*8x + 3x*1 - 2*8x - 2*1 - (8x*5x + 8x*6 + 1*5x + 1*6)
= 24x² + 3x - 16x - 2 - (40x² + 48x + 5x + 6)
= 24x² - 13x - 2 - 40x² - 53x - 6
= -16x² - 66x - 8