Bonsoir
1) MN = 200-2x
Aire de MNPQ = x(200-2x)= 200x-2x² = -2x²+200
2) Aire totale = 18 400 m²
Aire espace vert = 13450 m²
Aire totale _ Aire pelouse = Aire salle
a)
18400 - 13450 = 200x-2x²
4950 = 200x-2x²
b) -2x²+200x-4950 = 0
delta = b²-4ac = 40 000 - 39600 = 400 alors Vdelta = 20
solutions (-b-Vdelta)/ 2a = 45
(-b+Vdelta)/2a = 55
