salut
exo 21
f(x)=(2x+1)²-4
4x²+4x+1-4
4x²+4x-3
g(x)= x(x-3)²
x(x²-6x+9)
x^3-6x²+9x
h(x)= -2(x-3)²+1
-2(x²-6x+9)+1
-2x²+12x-17
i(x)= (x-5)(x+3)-x(x-2)
x²-2x-15-x²+2x
=-15
exo 22
f(x)=7x+14
7(x+2)
g(x)=x(x-1)-2x
x²-x-2x
x²-3x
x(x-3)
h(x)=(x+1)(x-3)+(x+4)(x+1)
(x+1)(x-3+x+4)
(x+1)(2x+1)
i(x)=(3x-2)(x+2)-(3x-2)(3x+1)
(3x-2)(x+2-3x-1)
(3x-2)(-2x+1)
