Answer:
375
Also, is this really a college question?
Explanation:
Take equation 2st^2-s^2
If s is equivalent to 3 and t is equivalent to 8, then substitute t for 8 and s for 3 in the equation, which would result in a new solveable equation:
2(3)(8)^2 -3^2
= 2(3)64-9
= 6(64)-9
= 384-9
= 375
The result would be 375.