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Anaisvg
@Anaisvg
April 2019
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Développer et réduire :
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(4x)^2 - 2^2 -[ 9x^2 + 30x + 25] =16x^2 -4 - 9x^2 -30x -25 =7x^2 -30x -29
0 votes
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PAU64
^ c'est puissance donc ^2 = puissance 2
PAU64
(4x + 2) (4x - 2) - (3x + 5)²
= (4x)² - 2² - [(3x)² + 2 * 3x * 5 + 5²]
= 16x² - 4 - (9x² + 30x + 25)
= 16x² - 4 - 9x² - 30x - 25
= 7x² - 30x - 29
2 votes
Thanks 1
PAU64
les * signifient "fois"
PAU64
de rien :)
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= (4x)² - 2² - [(3x)² + 2 * 3x * 5 + 5²]
= 16x² - 4 - (9x² + 30x + 25)
= 16x² - 4 - 9x² - 30x - 25
= 7x² - 30x - 29