Consider the function f(x) = 9X. Which statement MUST be true?
Α)
f(4), f(8)
f(1) f(5)
B)
f(4)-f(1) = f(8) f(5)
C)
f(4) - f(1) = f(8) - f(5)
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20
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D)
f(4) - f(1) = f(-4) - f(-1)