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manonjutard
@manonjutard
January 2021
1
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j'ai pas compris au 32 a et b vous pouvez m'aider svp
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maudmarine
Verified answer
Bonjour,
a.
5 + 4x
= 5 + 4 * - 4
= 5 - 16
= - 9
5 (- 3x - 11)
= 5 (- 3 * - 4 - 11)
= 5 (12 - 11)
= 5 (1)
= 5
x (x + 7)
= - 4 (- 4 + 7)
= - 4 (3)
= - 12
(3x + 15)²
= (3 * - 4 + 15)²
= (- 12 + 15)²
= 3²
= 9
5x² + 20x + 2
= 5 *(- 4)² + 20 * - 4 + 2
= 5 * 16 - 80 + 2
= 80 - 80 + 2
= 2
1 votes
Thanks 1
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Lista de comentários
Verified answer
Bonjour,a.
5 + 4x
= 5 + 4 * - 4
= 5 - 16
= - 9
5 (- 3x - 11)
= 5 (- 3 * - 4 - 11)
= 5 (12 - 11)
= 5 (1)
= 5
x (x + 7)
= - 4 (- 4 + 7)
= - 4 (3)
= - 12
(3x + 15)²
= (3 * - 4 + 15)²
= (- 12 + 15)²
= 3²
= 9
5x² + 20x + 2
= 5 *(- 4)² + 20 * - 4 + 2
= 5 * 16 - 80 + 2
= 80 - 80 + 2
= 2