Final answer:
To evaluate the expression 12x^2 - 21x - 2 for the given value 3, the result is 77.
Step-by-step explanation:
To evaluate the expression 12x^2 - 21x - 2 for the given value 3, we substitute x with 3 and perform the necessary calculations.
12(3)^2 - 21(3) - 2
144 - 63 - 2
79 - 2
77