Advanced Math practice question

Answer: 0

f(0) = 0 − 0 = 0 and f(3) = 9 − 9 = 0. Their sum is 0.

Common wrong answers

If you answered 3

3 is f(0) + 3 or a similar slip; both function values are 0.

If you answered 9

9 is 3², forgetting to subtract 3(3) = 9 in f(3).

If you answered -9

−9 comes from 0 − 9, treating f(3) as −3(3) without the 3² term.

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