High school function problem, please specify the steps to solve the problem: If f (x) = (x ^ 2) + log (under x + root (1 + x ^ 2)), and f (2) = 3, then f (- 2) =?

High school function problem, please specify the steps to solve the problem: If f (x) = (x ^ 2) + log (under x + root (1 + x ^ 2)), and f (2) = 3, then f (- 2) =?

F (2) = 4 + log (a) (2 + √ 5) = 3, log (a) (2 + √ 5) = 1, f (- 2) = 4 + log (a) (- 2 + √ 5) = 4 + log (a) [1 / (2 + √ 5)] = 4-log (a) (2 + √ 5) = 4 - (- 1) = 5