Prove that

Everything I try isn't working that easily. I start by doing but i'm not really sure what to do from here!

Printable View

- Nov 11th 2009, 01:09 AMShowcase_22Inequality
Prove that

Everything I try isn't working that easily. I start by doing but i'm not really sure what to do from here! - Nov 11th 2009, 02:31 AMtonio
- Nov 11th 2009, 02:42 AMShowcase_22
I thought I could get there via an inequality route. =S

Discriminant=

This implies that the quadratic only has 1 root and this root is repeated. Therefore a graph of this quadratic would have a minimum point that touches the x axis. Hence the entire quadratic would be greater than 0.

For a proof though, would it be better to construct the quadratic first, work all this out and eventually arrive at it must be greater than 0? - Nov 11th 2009, 03:00 AMtonio
- Nov 11th 2009, 10:17 AMShowcase_22
JHS and HS?? =S

Thanks for your help, I think this question is pretty much done.