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MissRusse
@MissRusse
May 2019
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Bonjour,
Je suis en 4ième, et voici les deux exercices de maths que je n'arrive pas à faire :
I) Calculer la valeur des expressions.
A = 4X - 5 avec X = -3
B = -2 (Y + 3) avec Y = 4,5
C = 2X² + 3 X - 2 avec X = -5
II) Développer et réduire les expressions.
A = (X + 7) (X + 2)
B = (2X + 5) (2 + 3X)
C = (X + 6) (-X + 2) (-4)
Pouvez-vous m'aider s'il vous plait ?
Merci,
Cordialement
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winner123
Verified answer
Bonjour
a = 4 x - 5
pour x = - 3, a = - 12 - 5 =
- 17
b = - 2 y - 6
pour y = - 4.5 , B = 9 - 6 =
3
c = 2 x² + 3 x - 2
pour x = - 5, c = 50 - 15 - 2 =
33
a = x² + 2 x + 7 x + 14 =
x² + 9 x + 14
b = 4 x + 6 x² + 10 + 15 x =
6 x² + 19 x + 10
c = ( - x² + 2 x - 6 x + 12) ( - 4)
c = ( - x² - 4 x + 12) ( - 4)
c = 4 x² + 16 x - 48
1 votes
Thanks 1
MissRusse
Je te remercie !
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Verified answer
Bonjoura = 4 x - 5
pour x = - 3, a = - 12 - 5 = - 17
b = - 2 y - 6
pour y = - 4.5 , B = 9 - 6 = 3
c = 2 x² + 3 x - 2
pour x = - 5, c = 50 - 15 - 2 = 33
a = x² + 2 x + 7 x + 14 = x² + 9 x + 14
b = 4 x + 6 x² + 10 + 15 x = 6 x² + 19 x + 10
c = ( - x² + 2 x - 6 x + 12) ( - 4)
c = ( - x² - 4 x + 12) ( - 4)
c = 4 x² + 16 x - 48