Advanced Math practice question

Answer: 10

Both 1 and 7 are 3 units from the axis of symmetry x = 4, so they share a value: f(1) = 9 + 1 = 10.

Common wrong answers

If you answered 1

1 is the minimum value, at x = 4.

If you answered 9

9 is (1 − 4)², forgetting the +1.

If you answered 20

20 adds f(1) and f(7) together; the question asks for the shared value.

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