Open Middle®
Directions: Using the digits 0 to 9 at most one time each, fill in the boxes to so that there is only one solution.
Hint
How could you find the equation if you already knew the solution?
Answer
There are two answers x^2 + 6x + 9 = 0 which has the solution -3 and 9x^2 + 6x + 1 = 0 which has the solution -1/3.
Source: Daniel Luevanos
