a- 4+(x - 3 ) x 5 = 4 + 5x -15 = 5x - 11
b- 2x (x + 1 ) - x = 2x² + 2x - x = 2x² + x
c- -(4 - x) x2 = (-4 +x )x 2= - 8 + 2x = 2( - 4 + x)
d- 3 x (5x x2) + 4 = ( 15x x 6) +4 = 90x + 4
e- 3 x x + x x 2x+ 3 x 4 + 2 x x 4 = 3x + 2 x² +12 + 8x =2x² + 11x + 12
