Bonsoir aidez moi svp Developer réduire et ordonner A(x) =2x(x-3)-5(x-1)(x+2) C(x)=(x+3)(-2x+1)-3x(x-2) B(x) = - x(x+2)-3(x^2 - 2) +2^2 - 6 D(x)=(7x-3)(-10x - 2

bonjour

A(x) =2x(x-3)-5(x-1)(x+2)

A ( x ) =  2 x² - 6 x - 5 ( x² + 2 x - x - 2 )

A ( x) =  2 x² - 6 x - 5 x² - 10 x + 5 x + 10

A ( x) =  - 3 x² - 11 x + 10

C(x)=(x+3)(-2x+1)-3x(x-2)

C (x) =  - 2 x² + x - 6 x + 3 - 3 x² + 6 x

C (x) = - 5 x² + x + 3

B(x) = - x(x+2)-3(x^2 - 2) +2^2 - 6

B (x) =  - x² - 2 x - 3 x² + 6 + 4 - 6

B (x) =   - 4 x² - 2 x + 4

D(x)=(7x-3)(-10x - 2)+5(x+2)

D (x) =  - 10 x² - 14 x + 30 x + 6 + 5 x + 10

D (x) =  - 10 x² + 21 x + 16  

Bonsoir,

A(x) =2x(x-3)-5(x-1)(x+2)

= 2x² -6x -[(5x-5)(x+2)]

= 2x² -6x  -(5x+10 -5x -10)

=  2x² -6x  -5x-10 +5x +10

= 2x² -6x

C(x)=(x+3)(-2x+1)-3x(x-2)

= -2x² +x -6x +3 -3x² +6x

= -5x² +x +3

B(x) = - x(x+2)-3(x² - 2) +2² - 6

= -x² -2x -3x² +6 +4 -6

= -4x² -2x +4

D(x)=(7x-3)(-10x - 2)+5(x+2)

-70x² -14x +30x +6 +5x +10

= -70x² +21x +16