Bonsoir,
développer (x-7)(2x+3)= 2x²-14x+3x-21= 2x²-11x-21
factoriser x²-x= x(x-1)
factoriser x²-1= (x-1)(x+1)
développer (x+5)(x-5)+(x-5)= x²-5x+5x-25+x-5= x²+x-30
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Bonsoir,
développer (x-7)(2x+3)= 2x²-14x+3x-21= 2x²-11x-21
factoriser x²-x= x(x-1)
factoriser x²-1= (x-1)(x+1)
développer (x+5)(x-5)+(x-5)= x²-5x+5x-25+x-5= x²+x-30