.
What is written in the post is not a quadratic equation.
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Comment from student: Ah.. sorry I didn't simplify it enough, but now I got it, the equation is x^2-6x-1=0
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My response:
= 0 ====> Use quadratic formula ====>
= = = .
= ; = .
Solved.
On using quadratic formula to solve quadratic equations see the lessons
- Introduction into Quadratic Equations
- PROOF of quadratic formula by completing the square
in this site.
Also, you have this free of charge online textbook in ALGEBRA-I in this site
- ALGEBRA-I - YOUR ONLINE TEXTBOOK.
The referred lessons are the part of this textbook under the topic "Quadratic equations".