i need to show

now i have shown

which gives me

clearly the expression is so i need to show

this is simple enough by considering

as

so [*]>0

What i would like to do is not use the result and start from scratch to show

using only

i cant seem to get the result, alwayus end up with an inequality round the wrong way so cant deduce the result. Maybe it cant be done this way which is why they gave the value -1 or im making a mistake: