Question 1193021
.


Use the Gauss theorem (another name: Fundamental Theorem of Algebra), which states that the number of (complex) roots 


of any polynomial is equal to the degree of this polynomial.




See this Wikipedia article 


https://en.wikipedia.org/wiki/Fundamental_theorem_of_algebra




Or derive your own formula for this simple quadratic equation, giving its roots explicitly (as Sir Edwin did in his post).