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Salyne
@Salyne
April 2019
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Aider moi pour cette exercice svp :
On considere la fonction g définie par g(x) = 9x² - 64 + (3x - 8 ) ( 1 - 5x) - (3x - 8)²
1) Développer cette expression
2 ) Factoriser cette expression
merci d'avance
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loulakar
Verified answer
1) G(x)=9x²-64+3x-15x²-8+40x-(9x²-48x+64)
G(x)=-6x²+43x-72-9x²+48x-64
G(x)=-15x²+91x-136
2) G(x)=(3x-8)(3x+8)+(3x-8)(1-5x)-(3x-8)²
G(x)=(3x-8)[3x+8+1-5x-3x+8]
G(x)=(3x-8)(-5x+17)
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Salyne
j'ai encore une autre question : Utilise la forme qui te semblela plus adaptée pour calculer la valeur exacte de g(0) , g(racine carré de 3 ) et g ( 1 + racine caré 2 )
loulakar
G(0)=(3*0-8)(-5*0+17)=-8*17=-136
loulakar
G(√3)=-15*(√3)²+91√3-136=-15*3+91√3-136=-45-136+91√3=-181+91√3
loulakar
G(1+√2)=[3*(1+√2)-8][-5*(1+√2)+17]=(3+3√2-8)(-5-5√2+17)=(3√2-5)(12-5√2)=36√2-30-60+25√2=61√2-90
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Verified answer
1) G(x)=9x²-64+3x-15x²-8+40x-(9x²-48x+64)G(x)=-6x²+43x-72-9x²+48x-64
G(x)=-15x²+91x-136
2) G(x)=(3x-8)(3x+8)+(3x-8)(1-5x)-(3x-8)²
G(x)=(3x-8)[3x+8+1-5x-3x+8]
G(x)=(3x-8)(-5x+17)