(2x+5)²= 2x²+2*2x*5+5²
           = 2x²+20x+25

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Grade: Education Subject: mathematiques
(2x+5)²= 2x²+2*2x*5+5²
           = 2x²+20x+25
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Best Answer
(121)
Faux ! Attention :

(2x + 5)²
= 2x * 2x + 2 * 2x x 5 + 5 x 5
= 4x² + 20x + 25