GMAT Question of the Day

September 8, 2014



Every weekday, GMAT Hacks publishes a realistic GMAT practice question. In general, you'll see Quant problems on Monday, Wednesday, and Friday, and Verbal questions on Tuesday and Thursday. You'll always be able to find them at

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Today's Practice GMAT Question:

If the function f(x) = k(x - k) and k is a constant, what is the value of f(4) - f(3), in terms of k?
(A) 1
(B) k
(C) 7k - 1
(D) k^2 + k
(E) k^2 - k


Click to show answer (opens in new window)


Need more work in this area? Check out the Extreme: Challenge set of (100) practice problems.There is also a full chapter covering Functions in Total GMAT Math. It includes additional practice problems, as well.

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About the author: Jeff Sackmann has written many GMAT preparation books, including the popular Total GMAT Math, Total GMAT Verbal, and GMAT 111. He has also created explanations for problems in The Official Guide, as well as 1,800 practice GMAT math questions.

Total GMAT Math

The comprehensive guide to the GMAT Quant section. It's "far and away the best study material available," including over 300 realistic practice questions and more than 500 exercises!
Click to read more.