Question
Bonsoir développez l’expression (il y a 1 identité remarquable) : 2(9x+4)-(7x+1) (7x-1)
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Answer (91)
bonsoir
2 ( 9 x + 4) - ( 7 x + 1 ) ( 7 x - 1 )
= 18 x + 8 - ( 49 x² - 1 )
= 18 x + 8 - 49 x² + 1
= - 49 x² +18 x + 9
Réponse : Bonsoir !
On remarque l'identité remarquable (a + b)(a - b) = a² - b²
2(9x+4)-(7x+1) (7x-1)
= 18x + 8 -(49x² - 1)
= 18x + 8 - 49x² + 1
= 18x + 9 - 49x²
Bon courage pour la suite !