OpenStudy (anonymous):

7. The equation of a curve is xy=10 and the equation of a line l is 2x+y=q, where q is a number.
(i) Find the set of values of q for which l does not intersect the curve.
I am on the right track I think but I don't know how to get the answer. I will upload a picture of my working out but basically I got q

OpenStudy (anonymous):

and the actual answer is \[-\sqrt{80}<q<\sqrt{80}\]

3 years ago
OpenStudy (anonymous):

So basically I don't know why this is the answer or how to get it. Please help!

3 years ago
OpenStudy (anonymous):
3 years ago

OpenStudy (anonymous):

The coordinates that I marked are from a previous question. But thats my working out

3 years ago
OpenStudy (anonymous):

So are you saying that their answer is just a different form of mine?

3 years ago