So a is greater than 0.
If square B minus 4ac is less than 0, it means that no matter what X is taken, ax2-ax+ 1/a(a is greater than 0) is a number greater than 0.
When square B minus 4ac equals 0, it means that no matter what X takes, ax2-ax+ 1/a(a is greater than 0) is a number greater than or equal to 0.
So you have to calculate that B minus 4ac is less than or equal to 0, and A is greater than 0.
(Subtracting 4ac from Party B means treating the equation as AX 2+BX+C and then doing it, which is △).