A= 6x-(5x+4)
= x-4
B= 7(3x+4)-6
= 21x+22
C= (x-4)(2x-5)
= 2x²-3x+20
D= (2x+5)(3x-1)+5(x-2)
=6x²+22x-5
A = 6x - (5x + 4)
A = 6x - 5x - 4
A = x - 4
B = 7 (3x + 4 ) - 6
B = 21x + 28 - 6
B = 21x + 22
C= ( x - 4 ) ( 2x - 5 )
C = 2x² - 5x - 8x + 20
C = 2x² - 13x + 20
D = (2x + 5 ) ( 3x - 1 ) + 5 ( x - 2 )
D = 6x² - 2x + 15x - 5 + 5 ( x - 2 )
D = 6x² - 2x + 15x - 5 + 5x -10
D = 6x² + 18x - 15
et voila :) si tu comprends pas regarde jtai mis les étapes pour faire les calculs :)
