If x>2

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• Dec 5th 2012, 11:12 AM
someguy123
If x>2
If x>2 then x2-x-6 =
x2-4
can you show with steps please thank you!
• Dec 5th 2012, 11:51 AM
topsquark
Re: If x>2
Quote:

Originally Posted by someguy123
If x>2 then x2-x-6 =
x2-4
can you show with steps please thank you!

Your question is a bit garbled. What's going on in the bottom line? Could you spell it out? (Or you can quickly look at the LaTeX forum.)

-Dan
• Dec 5th 2012, 11:53 AM
someguy123
Re: If x>2
sorry the xsquared - 4 is supposed to be directly under i dont know what happened so xsquared-x-6/xsquared-4
• Dec 5th 2012, 12:03 PM
Link
Re: If x>2
Yes and there is something after "=" ?
• Dec 5th 2012, 12:06 PM
someguy123
Re: If x>2
no thats whats supposed to be figured out
• Dec 5th 2012, 12:11 PM
Link
Re: If x>2
well notice that x²-4=(x-2)(x+2), from here come the idea that 2 or -2 is a zero of x²-x-6. In fact -2 is a zero, so x²-x-6=(x+2).Q(x), and Q(x) is some polynomial, after computation q(x)=x-3.
So the answer is (x-3)/(x-2)
• Dec 5th 2012, 04:49 PM
topsquark
Re: If x>2
@someguy123: Be sure you understand why we have to have x > 2. (Actually x can be anything but 2, but let's stick to the original.)

-Dan