Question: Suppose that a function f(r) is defined and continuous on [1, 7] and such that f(1) = -1979, f(3) = 2018, f(5) - -2020 and

Suppose that a function f(r) is defined and continuous on [1,

Suppose that a function f(r) is defined and continuous on [1, 7] and such that f(1) = -1979, f(3) = 2018, f(5) - -2020 and f(7) = 1776. Show that it must have at least three roots

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