DerivativeApplications

# 5. intersection points with axis

In order to find the intersection point with the axis, we have to solve the systems:

**Exercise**: find the intersection points with axis of these functions:

a) f(x) = x^{4}- x^{3}- 21x^{2}+ 45x

b) f(x) = ln(x^{2}- 3x + 3)

Solutions: a) (-5,0),(0,0),(3,0); b) (1,0),(2,0),(0,ln3)

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