Can anyone point me in the right direction for this problem? I can't seem to approach it from the right angle:(adsbygoogle = window.adsbygoogle || []).push({});

Let A, B, C be real numbers such that [tex]A>0[/tex], [tex]B>0[/tex], [tex]AC-B^2>0[/tex].

a.that a number [tex]Q>0[/tex] exists such that [tex]Ax^2+2Bxy+Cy^2 \geq Q(x^2+y^2)[/tex]Prove

b. Find the largest possible Q.

I don't need answers (or rather, I do, but, you know what I mean; my main concern is figuring out how to approach this without my head exploding. Thanks in advance.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Random problem from vector cal

**Physics Forums | Science Articles, Homework Help, Discussion**