Ivan Shishkin, Rye (1878)

Problems/Set theoryExerciseUnreviewed

Exemples d’images par une fonction

by Ancient Tree·
8
Difficulty scaleÉchelle de difficulté

This score reflects both the level of the required concepts and the difficulty of the solution.Ce score tient compte à la fois du niveau des notions nécessaires et de la difficulté de la résolution.

  1. 1–10First steps / middle schoolPremiers pas / collège
  2. 11–25Beginner / high schoolDébutant / lycée
  3. 26–50Intermediate / undergraduateIntermédiaire / licence
  4. 51–70Advanced / graduateAvancé / master
  5. 71–90Expert / specializedExpert / spécialisé
  6. 91–100Research levelNiveau recherche
These levels are approximate guides.Ces niveaux sont des repères approximatifs.
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Soit f(x)=2x+3f(x)=2x+3.

Quelle est l'image de 4 par ff ?
Quelle est l’image de −2-2 par ff ?

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Solution by Ancient Tree

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L’image de 44 par ff est f(4)=2×4+3=11f(4)=2\times 4+3=11.

L’image de −2-2 par ff est f(−2)=2×(−2)+3=−1f(-2)=2\times (-2)+3=-1.

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