1)
M= (2x+1)^ + (x-3)(2x+1)
M= 4x^+4x+1 + 2x^+1x-6x-3
M= 4x^+2x^+4x+1x-6x+1-3
M= 6x^-1x-2
2)
M= (2x+1)^ + (x-3)(2x+1)
M= (2x+1) [(2x+1)+(x-3)]
M= (2x+1) (2x+1+x-3)
M= (2x+1) (3x-2)
3)
M= 6 X 5^ - 1 X 5 - 2
M= 6 X 25 - 5 - 2
M= 150 - 5 - 2
M= 143
4)
(2x+1) (3x-2) = 0
2x+1 = 0
2x+1-1 = 0-1
2x = -1
2x/2 = -1/2
x = -1/2 = - 0,5
3x-2 = 0
3x-2+2 = 0+2
3x = 2
3x/3 = 2/3
x = 2/3
La solution pour que x est de 0 est de -0.5 ou 2/3.