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Sagot :

COCOPHOENIX

Réponse :

P=(2x+3)² + (3x-2)(3x+2)

P= 4x^2 +12x+9+9x^2-4

P= 13x^2 +12x +5

Q=(5x-2)(x+7)+(5x-2)²

Q= 5x^2 +33x-14+25x^2 -20x +4

Q= 27x^2 + 13x -10

R=9x²-16+4(3x-4)²

R=9x^2 -16 +36x^2-96x+64

R= 45x^2 -96x +48

S=(2x+1)²-(x+2)²

S= 4x^2+4x+1 -x^2 -4

S= 3x^2+4x -3

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