Sagot :
Bonsoir
1)
R(x) = 19x
2)
B(q) = R(q) -C(q)
B(q) = 19q-0.02q²- 8q+500
B(q) = -0.02q²-11q+500
c)
B(q) = 0
calcul du delta
delta= b²-4ac = 121-40 = 81
Vdelta= 9 ( V veut dire racine)
deux solutions
q' = (-b-Vdelta)/2a = (-11-9)/-00.04 = -20 /-0.04 = 500
q" = (-b+Vdelta)/2a = -2/-0.04 = 50
B(q) maxi = -b /2a = -11 /-0.04 = 275 enjoliveurs