Soit E= (3x-5)² - (3x-5)(6x+2)
1) Développer et réduire l'expression E.
2) Factoriser E
3) Calculer E pour x=
Aidez moi svp. :33
1)(3x-5)(3x-5)-(3x-5)(6x+2)
(9x²-15x-15x+25)-(18x²+6x-30x-10x)
(9x²-15x-15x+25-18x²-6x+30x+10)
9x²-18x²-15x-15x-6x+30x+25+10
-9x²-6x+35
2)(3x-5) [(3x-5)-(6x+2)]
(3x-5) [3x-5-6x-2]
(3x-5) [-3x-7]
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1)(3x-5)(3x-5)-(3x-5)(6x+2)
(9x²-15x-15x+25)-(18x²+6x-30x-10x)
(9x²-15x-15x+25-18x²-6x+30x+10)
9x²-18x²-15x-15x-6x+30x+25+10
-9x²-6x+35
2)(3x-5) [(3x-5)-(6x+2)]
(3x-5) [3x-5-6x-2]
(3x-5) [-3x-7]