Practice problem
Define f(x)f(x)f(x) as follows: For every integer kkk, if x∈[k,x+1)x \in [k, x+1)x∈[k,x+1), let f(x)=k(x+1)−k2f(x) = k(x+1) - k^2f(x)=k(x+1)−k2. What is f(123456789)f(123456789)f(123456789)?
123456789
987654321
246813579
135792468
Type a concept, like “slope” or “photosynthesis”.
