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Salut59
@Salut59
April 2019
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AIDER MOI JEN PEUX PLUS!!!!!!!!!!!!!
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PAU64
Verified answer
Exercice 2 :
a) 1. D = (2 - 5x) (4x + 3) - (2 - 5x)²
D = 2 X 4x + 2 X 3 - 5x X 4x - 5x X 3 - [2² - 2 X 2 X 5x + (5x)²]
D = 8x + 6 - 20x² - 15x - (4 - 20x + 25x²)
D = 8x + 6 - 20x² - 15x - 4 + 20x - 25x²
D = - 45x² + 13x + 2
Pour x = - 1
D = - 45x² + 13x + 2
D = - 45 X (- 1)² + 13 X (- 1) + 2
D = - 45 X 1 - 13 + 2
D = - 45 - 13 + 2
D = - 56
b) 51² =
(50 + 1)² =
50² + 2 X 50 X 1 + 1² =
2 500 + 100 + 1 =
2 601
69² =
(70 - 1)² =
70² - 2 X 70 X 1 + 1² =
4 900 - 140 + 1 =
4 761
23 X 17 =
(20 + 3) (20 - 3) =
20² - 3² =
400 - 9 =
391
c) (x +
3
)² =
x²
+ 6x +
9
(
2x
-
5
)² = 4x² -
20x
+ 25
(7x +
8
) (
7x
-
8
) =
49x²
- 64
2 votes
Thanks 2
Salut59
MERCI BCP JAO ENCORE UN EXERCICE TU PEUX MAIDER?????
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Salut59
January 2021 | 0 Respostas
AIDER MOI SVP !!!! jdonne 20 points
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Salut59
April 2019 | 0 Respostas
Aider moi svp..!!!!! :'( merci.. bon weekend..
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Salut59
April 2019 | 0 Respostas
AIder MOI SVP LUI QUI TROUVE JLUI DONNE 20 POINT!!!
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Verified answer
Exercice 2 :a) 1. D = (2 - 5x) (4x + 3) - (2 - 5x)²
D = 2 X 4x + 2 X 3 - 5x X 4x - 5x X 3 - [2² - 2 X 2 X 5x + (5x)²]
D = 8x + 6 - 20x² - 15x - (4 - 20x + 25x²)
D = 8x + 6 - 20x² - 15x - 4 + 20x - 25x²
D = - 45x² + 13x + 2
Pour x = - 1
D = - 45x² + 13x + 2
D = - 45 X (- 1)² + 13 X (- 1) + 2
D = - 45 X 1 - 13 + 2
D = - 45 - 13 + 2
D = - 56
b) 51² =
(50 + 1)² =
50² + 2 X 50 X 1 + 1² =
2 500 + 100 + 1 =
2 601
69² =
(70 - 1)² =
70² - 2 X 70 X 1 + 1² =
4 900 - 140 + 1 =
4 761
23 X 17 =
(20 + 3) (20 - 3) =
20² - 3² =
400 - 9 =
391
c) (x + 3)² = x² + 6x + 9
(2x - 5)² = 4x² - 20x + 25
(7x + 8) (7x - 8) = 49x² - 64