_MATH1013_1ABCD_2025 Subsection 3.3 (closed on 11 Oct)

Let [math: f] be a continuous function defined on the domain [math: (0,4)]. If [math: f(1)=−1]f(1)=-1 and [math: f(3)=3], then the equation [math: f(x)=0] has at least one solution.