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Developper et reduire a=(3x-2) au carre moins 10au carre

 

Factoriser 

 

Resoudre A=0

Sagot :

DROOPETTE
a=(3x-2)²-10²
=9x²-12x+4-10x²
=-x²-12x+4

a=(3x-2)²-10²
=(3x-2-10)(3x-2+10)
=(3x-12)(3x+8)
=3(x-4)(3x+8)

3(x-4)(3x+8)=0
si x=4 ou x=-8/3

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