SOLUTION: Solve: 16x^2-72x=-85
Not sure if I'm suppose to factor or use the quadratic equation? Help would be appreciated! :)
Algebra.Com
Question 751745: Solve: 16x^2-72x=-85
Not sure if I'm suppose to factor or use the quadratic equation? Help would be appreciated! :)
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
I don't know which method they want you to use, but
I can try completing the square
---------------------
First, divide both sides by
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Take 1/2 of the coefficient of ,
square it, and add it to both sides
Take the square root of both sides
and, also
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Here's the plot:
Since it doesn't contact the x-axis, there are no real roots
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