Hard Functions Problem for the SAT Today I would like to give a hard functions problem from the book 28 SAT Math Lessons – Advanced Course. I will provide a full explanation for this problem tomorrow. Feel free to leave your own solutions in the comments. Level 5 Functions For which of the following functions is it true that f(-x) = f(x) for all values of x ? A) f(x) = x2 + 5 B) f(x) = x2 + 5x C) f(x) = x3 + 5x D) f(x) = x3 + 5 If you’re having trouble getting started, you may want to read the following post: Even and Odd Functions More SAT and ACT Math Problems with Explanations If you are preparing for the SAT, ACT, or an SAT math subject test, you may want to take a look at the Get 800 collection of test prep books. And if you liked this article, please share it with your Facebook friends: Comments comments