Question 1130187
.
I just answered it before (under this link)

https://www.algebra.com/algebra/homework/quadratic/Quadratic_Equations.faq.question.1129995.html


and can only repeat it again:



            You INCORRECTLY presented the function in your post.



I can not  (and don't want)  to explain the solution to a person,  who does not understand his  (or her)  own question 
and don't know the basics of things.