Open Middle®
Directions: Using the digits 1 to 9, find one pair of digits to fill in the boxes to create expressions that produce one rational root and three irrational roots.
Hint
What perfect square and/or cube root numbers are there from 1 to 9?
Answer
One possible answer is 6 & 2
Source: Norma Gordon
Does 9 & 7 work?
9×7 =64
9+7=16
6,2
9 & 4 works almost every time
9+4=13
9-4=5
9*4=36
9/4=2.25