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Madi0901
@Madi0901
April 2019
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On considère les expressions :
A= (x+2)(x-3)+(x-3) et B= (2x-3)au carré m
a. Développé et réduire les deux expressions.
b. Calculer A pour x=3
c. Calculer B pour x=1.5
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maudmarine
Verified answer
Bonjour,
On considère les expressions :
A= (x+2)(x-3)+(x-3) et B= (2x-3)²
a. Développer et réduire les deux expressions.
A= (x+2)(x-3)+(x-3)
A = x² - 3x + 2x - 6 + x -3
A = x² - 9
B = (2x - 3)²
B = 4x² - 12x + 9
b.
Calculer A pour x=3
A = x² - 9
A = 3² - 9
A = 9 - 9
A = 0
c.
Calculer B pour x=1.5
B = 4x² * 12x + 9
B = 4 * (1,5)² - 12 * (1,5) + 9
B = 4 * 2,25 - 18 + 9
B = 9 - 18 + 9
B= 18 - 18
B = 0
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Verified answer
Bonjour,On considère les expressions :
A= (x+2)(x-3)+(x-3) et B= (2x-3)²
a. Développer et réduire les deux expressions.
A= (x+2)(x-3)+(x-3)
A = x² - 3x + 2x - 6 + x -3
A = x² - 9
B = (2x - 3)²
B = 4x² - 12x + 9
b. Calculer A pour x=3
A = x² - 9
A = 3² - 9
A = 9 - 9
A = 0
c. Calculer B pour x=1.5
B = 4x² * 12x + 9
B = 4 * (1,5)² - 12 * (1,5) + 9
B = 4 * 2,25 - 18 + 9
B = 9 - 18 + 9
B= 18 - 18
B = 0