Réponse:

a) p(X) = 4x+10

B) A(X) = (X+5) *X

= X*X + 5x

= X au carré + 5x

P= (x+x+5) * 2 = (2x+5) *2 = 4x + 10

Aire = x * (x+5) = x² + 5x

4x + 10 = 121

4x = 121-10

4x = 111

x = 111 / 4

x = 27.75

27.75 + 5 = 32.75

La largeur mesure 27.75 m et la longueur 32.75 m