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dede94
@dede94
January 2021
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Bonsoir , pouvez-vous m'aidez svp merci :) Développer puis réduire les expressions suivantes : (5x-9)2( le 2 au carré et apres le 5 cest la lettre x ) 2(x+3)2-10 ( 2 au carré aussi ) merci
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winner123
Verified answer
Bonsoir
( 5 x - 9)² rappel de 3ème identité remarquable
= 25 x² - 90 x + 81
2 (x + 3)² - 10 ²
= 2 (x² + 6 x + 9) - 10 ²
= 2 x² + 12 x + 18 - 100
= 2 x² + 12 x - 82
2 votes
Thanks 1
dede94
Bonsoir pour le premièr calcule , le 90x sors d'où svp je n'es pas tres bien compris
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Verified answer
Bonsoir( 5 x - 9)² rappel de 3ème identité remarquable
= 25 x² - 90 x + 81
2 (x + 3)² - 10 ²
= 2 (x² + 6 x + 9) - 10 ²
= 2 x² + 12 x + 18 - 100
= 2 x² + 12 x - 82