(2x-1)(-5-3x)+x ; (x+1)(x+1)-(x²-x) ; (3x+5)(-2x+1)+6x²+7x-5 ; (7x-2)(3-x)-2x+4 (-3-x)(2x-7) aider moi svp

(2x-1)(-5-3x)+x
= -10x-6x+5+3x+x
= -12x+5

bonsoir

(2 x - 1) ( - 5 -3 x) + x = - 10 x - 6 x² +5 + 3 x + x = - 6 x² - 6 x + 5

(x +1) ( x + 1) - ( x² - x )  = x² + x + x + 1 - x² + x = 3 x + 1

(3 x +5) ( - 2 x + 1) + 6 x² + 7 x - 5 = - 6 x² + 3 x - 10 x + 5 + 6 x² + 7 x - 5
= 0

(7 x - 2) ( 3 - x) - 2 x + 4 = 21 x - 7 x² - 6 + 2 x = - 7 x² + 23 x - 6

( -3 - x ) ( 2 x -7) = - 6 x + 21 - 2 x² + 7 x = - 2 x² + x + 21