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Sagot :

 G(x)=(3x-4)2 -(2x-7)(3x-4)=(9x^2-24x+16)-(6x^2-8x-21x+28)=9x^2-24x+16-6x^2+29x-28=

3x^2+5x-12

G(x)=(3x-4)2 -(2x-7)(3x-4)=(3x-4)(3x-4-2x+7)=(3x-4)(x+3)

(3x-4)(x+3)=0 si 3x-4=0 Ou si x+3=0

 

 ==> si x=4/3 ou x=-3   G(-5)=(3*(-5)-4)(-5+3)=-19*(-2)=38

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