M mbrown97 New member Joined Feb 21, 2007 Messages 1 Feb 21, 2007 #1 I am having trouble with quadratic equation with negative exponents in it. The problem is: x^-2-9x^-1+18=0. How do I begin. Any help is appreciated.
I am having trouble with quadratic equation with negative exponents in it. The problem is: x^-2-9x^-1+18=0. How do I begin. Any help is appreciated.
M mark07 Junior Member Joined Feb 3, 2007 Messages 84 Feb 21, 2007 #2 \(\displaystyle \L x^{-2} - 9x^{-1} +18 =0\) \(\displaystyle \L \frac{1}{x^2} - \frac{9}{x} +18 =0\) Multiply both sides by x^2, \(\displaystyle \L 18x^2 -9x +1 =0\) Can you finish now?
\(\displaystyle \L x^{-2} - 9x^{-1} +18 =0\) \(\displaystyle \L \frac{1}{x^2} - \frac{9}{x} +18 =0\) Multiply both sides by x^2, \(\displaystyle \L 18x^2 -9x +1 =0\) Can you finish now?
tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 11,337 Feb 21, 2007 #3 You may wish to remember that you have changed the Domain by this transformation. Be sure to check your answers before you think you are done.
You may wish to remember that you have changed the Domain by this transformation. Be sure to check your answers before you think you are done.
