For SOLVING equations only!
When ax2+bx+c=0, and a is not equal to 0:
x=(-b±√b² -4ac)/2a
b² -4ac is the discriminant:
- if it is 0, the quadratic only has 1 solution.
- if it is positive, there are 2 solutions
- if it is negative, there are NO solutions
- if it is a square number, there are 2 integer solutions
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