Bonjour,
Développer:
(2x+5)²= (2x+5)(2x+5)= 2x*2x+5*2x+2x*5+5*5= 4x²+10x+10x+25
= 4x²+20x+25
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Bonjour,
Développer:
(2x+5)²= (2x+5)(2x+5)= 2x*2x+5*2x+2x*5+5*5= 4x²+10x+10x+25
= 4x²+20x+25