Open Middle®
Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to make a polynomial of the highest degree.
Hint
Where should you put the 9?
Answer
One binomial must have an 8 and 9 for the two exponents and the other must have 7 and 6. The values of the coefficient and constants are irrelevant.
Source: Robert Kaplinsky