Open Middle®
Directions: Using the digits 2 to 9, fill in the boxes with a unique pair that create expressions that produce three rational roots and one irrational root.
Hint
What perfect square and/or cube root numbers are there from 1 to 9?
Answer
4 & 9
Source: Norma Gordon
Also 7 & 9!
Unfortunately Alexander, 7 & 9 would give two rational roots and two irriational roots (assuming the order is important)
I was thnking it was 4,9