The root formula is x 1=(-b-√△)/(2a), and x2=(-b+√△)/(2a).
x 1-x2 = x 1 =(-b-√△+ b-√△)/(2a)=(-2 √△)/(2a)=-√△/ a
So | x1-x2 | = |-√△/a | = √△/| a | (√△ is the arithmetic square root, which is not negative, so the sign of absolute value is not needed).
The Digital Mystery of Hutulo's Works
The expression of Hutuluo's calligraphy is the numerical relationship, which inevitably reflects the ancient mathematical l