Open Middle®
Directions: Using the integers −9 to 9 at most one time each, place an integer in each box to create an arithmetic sequence so that the coefficient in the function that represents it is the greatest possible value.
Hint
How can you shift a sequence so that you can use the integers you have available?
Answer
There greatest possible coefficient is 6 from: -3, 3, 9, … = 6x + -9
Source: Robert Kaplinsky
