What is x^2-8x-20=0 solving by completing the square?
Add 20 to both sides...
When completed we should have a function of the form
Now change it into our
Square root both sides:
And finally add 4 to both sides to isolate x.
First, move the
Simplifying the fractions:
Now that the LHS is a perfect square, we can factor it as
Taking the real (non-principal) square root: