How many roots can a quadratic equation have
2 answers:
Step-by-step explanation:
It all depends on the discriminants sign.
The quadratic equation:

The discriminant:

If Δ < 0, then the equation has no real solution
If Δ = 0, then the equation has one solution 
If Δ > 0, then the equation has two different solution

Answer:
2 roots, 1 root, or no roots
Step-by-step explanation:
There is a maximum of two roots
If the maximum or minimum is on the x-axis there is 1 repeated root
The roots are imaginary if it does not touch the x-axis
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