Développer Reduire et ordonner a = ( -10x -10 ) ( -x +1 ) + ( 18x +15 ) ( - x +1 Factoriser : b = ( 4x +1 ) ( 3x +2 ) - ( 6x +2 ) (4x +1 )

a = (-10x-10)(-x+1)+(18x+15)(-x+1)
a = (-x+1)(-10x-10+18x+15)
a = (-x+1)(8x+5)
a = -8x²-5x+8x+5
a = -8x²+3x+5

b = (4x+1)(3x+2)-(6x+2)(4x+1)
b = (4x+1)[(3x+2)-(6x+2)]
b = (4x+1)(3x+2-6x-2)
b = (4x+1)(-3x)

a = ( -10x -10 ) ( -x +1 ) + ( 18x +15 ) ( - x +1 )
a = (100)(-x+1) + (-18x²+18x-15x+15)
a = -100x+100 -18x²+3x+15
a =  -18x² -97x+115


Factoriser :
b = ( 4x +1 ) ( 3x +2 ) - ( 6x +2 ) (4x +1 )
b =(4x+1)(3x+2-6x-2)
b =(4x+1)(-3x)
b = -3x(4x+1)