Graphing Parabolas, Really weird answer

Question

Sep 16, 2007, 11:31 AM

Blondie2007

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Join Date: Sep 2007

Posts: 1

Graphing Parabolas, Really weird answer

So, I have the equation y= -3(x-2)^2-13
I tried to find the x-intercepts so that I could graph the parabola, but I got this crazy answer:

-2 plus or minus the square root of 39 over negative 3

???

Answers

Sep 16, 2007, 11:43 AM	#2

Capuchin Science Expert Join Date: Oct 2006 Location: UK Posts: 5,236	Is there any reason why you're not expecting "crazy answers"?

Sep 16, 2007, 11:46 AM	#3

galactus Mathematics Expert Join Date: Sep 2006 Location: Chaneysville, Pa. Posts: 1,656	This has two complex solutions. It does not cross the x axis. $y=-3(x-2)^{2}-13$ Set y to 0 and get $2+\frac{\sqrt{39}}{3}i, \;\ 2-\frac{\sqrt{39}}{3}i$ Attached Images

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