Applications:
a) Conjecturer à la calculatrice le nombre de solutions de l'équation
x³ + 2x²-5x - 10 = 0

b) Montrer que pour tout x réel x³ + 2x² - 5x-10 = (x + 2)(x² - 5)

c) En déduire les solutions de x³ + 2x² -5x - 10 = 0
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