Answer:
Step-by-step explanation:
Given that Jordan wants 6000 dollars after 3 years for making a family trip.
We have to find out the amount invested now to get the required 6000 dollars
We have interest of 8% compounded semi annually.
equivalent rate = 
If P is the amount invested now, then

He has to invest 4741.89 dollars now
I believe it would be 24a^2-18ab.