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- 1) a(x) = 2x - x2 +2-x-4x2-6x-4x-6 = -5x2 -9x -4
2) (x+1)(2-x)-2(x+1)(2x+3) = (x+1)(2-x-2(2x+3))=
(x+1)(2-x-4x-6)= (x+1)(-5x-4)
3) A(2)= (2+1)(-10-4)=-42
4) A(-1) = (-1+1)(5-4)= 0
A(2/3)= (-2/3 +1)(-5x(-2/3)-4) = 1/3 (10/3 -4)= 1/3 x(-2/3)= -2/9
5) A(x)= (x+1)(-5x-4) = 0
x+1 =0 ou -5x-4=0
x= -1 ou x= 4/5
