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Sachachachou1
@Sachachachou1
April 2019
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S'il vous plait c urgent je dois réviser le brevet blanc et je ne sais pas combien fait :
f(x)=2x au carré -5x+3 .L’image de -3 par f est ?
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Tu remplaces tous les x par - 3.
Ce qui donne :
f(- 3) = 2 x (- 3)² - 5 x (- 3) + 3
f(- 3) = 2 x 9 - (- 15) + 3
f(- 3) = 18 + 15 + 3
f(- 3) = 18 + 18
f(- 3) = 36
1 votes
Thanks 1
ayoub1belmellah
F(X)=2X^2-5X+3
f(-3) =2(-3)^2-5(-3)+3
=2x9+15+3
=36
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Lista de comentários
Ce qui donne :
f(- 3) = 2 x (- 3)² - 5 x (- 3) + 3
f(- 3) = 2 x 9 - (- 15) + 3
f(- 3) = 18 + 15 + 3
f(- 3) = 18 + 18
f(- 3) = 36
f(-3) =2(-3)^2-5(-3)+3
=2x9+15+3
=36