bonsoir
2-2(3x+2)(-3x+5)-3(-2x+3)(-3x-1)
= 2 - ( 6 x + 4 ) ( - 3 x + 5 ) - ( - 6 x + 9 ) ( - 3 x - 1 )
= 2 - ( - 18 x² + 30 x - 12 x + 20 ) - ( 18 x² + 6 x - 27 x - 9 )
= 2 + 18 x² - 30 x + 12 x - 20 - 18 x² - 6 x + 27 x + 9
= 3 x - 9
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bonsoir
2-2(3x+2)(-3x+5)-3(-2x+3)(-3x-1)
= 2 - ( 6 x + 4 ) ( - 3 x + 5 ) - ( - 6 x + 9 ) ( - 3 x - 1 )
= 2 - ( - 18 x² + 30 x - 12 x + 20 ) - ( 18 x² + 6 x - 27 x - 9 )
= 2 + 18 x² - 30 x + 12 x - 20 - 18 x² - 6 x + 27 x + 9
= 3 x - 9