bjr
C(x) = x² + 30x + 400
1)
C(25) = 25² + 30*25 + 400 = 625 + 750 + 400 = ...
C(12) = 12² + 30*12 + 400 = ...
C(67) = 67² + 30*67 + 400 = ...
2)
boite vendue 120€
=> 38 boîtes = 38 * 120
R(x) = 120x
3a) 120x = 2040 => x = 2040/120 = 17
b) 17 boîtes
B(x) = R(x) - C(x) = 120x - (x² + 30x + 400) = -x² + 90x - 400
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bjr
C(x) = x² + 30x + 400
1)
C(25) = 25² + 30*25 + 400 = 625 + 750 + 400 = ...
C(12) = 12² + 30*12 + 400 = ...
C(67) = 67² + 30*67 + 400 = ...
2)
boite vendue 120€
=> 38 boîtes = 38 * 120
R(x) = 120x
3a) 120x = 2040 => x = 2040/120 = 17
b) 17 boîtes
B(x) = R(x) - C(x) = 120x - (x² + 30x + 400) = -x² + 90x - 400