Réponse :
Explications étape par étape
P = 5.2 + x.2
x =7 P = 10 + 2.7 = 24 cm
x = 13 P = 10 + 2. 13 = 36 cm
A = 5x largeur . longueur
x = 7 A = 5 . 7 = 35 cm²
x = 13 A = 5.13 = 65cm²
A(x) = 100
A(x) = 5x = 100
⇔ x = 20
P = 10 +20+20 = 50cm
P(x) = 28cm
P = 5.2 + 2x = 28cm
⇔ P = 10 + 2x = 28 cm
⇔ 2x =18
⇔ x = 9
A = 5.9 = 45 cm²
x 7 13 20 9
P(x) 24 36 50 28
A(x) 35 65 100 45
b/ P(x) = 2x + 10 fonction affine
A(x) = 5x fonction linéaire
