bjr
h(x) = -5x² - 59x + 12
1)
recherche des racines
Δ = b²− 4ac = (-59)² - 4*(-5)*12 = 3721 = 61²
il y a deux racines
x1 = (59 - 61) / (-10) = -2/-10 = 1/5
x2 = (59 + 61) / (-10) = 120/ (-10) = - 12
il y a deux racines :
-12 et 1/5
2)
forme factorisée
a(x - x1)(x - x2)
h(x) = -5 (x -1/5)(x + 12)
h(x) = (-5x + 1)(x + 12)