Final answer:
To evaluate the expression 72/x²-2 for x=3, substitute the value of x into the expression and simplify to get the result as 6.
Step-by-step explanation:
To evaluate the expression 72/x²-2 for x=3, we substitute the value of x into the expression:
72/3²-2
Simplifying, we get:
72/9-2 = 8-2 = 6