1. Substitute the values:
The expression is 6s³ - 2st. We are given s = 2 and t = -3. Substitute these values:
6(2)³ - 2(2)(-3)
2. Calculate the exponent:
2³ = 2 * 2 * 2 = 8
The expression becomes:
6(8) - 2(2)(-3)
3. Perform multiplication:
6 * 8 = 48
2 * 2 * -3 = -12
The expression becomes:
48 - (-12)
4. Perform subtraction (remembering that subtracting a negative is the same as adding a positive):
48 - (-12) = 48 + 12 = 60
Therefore, the answer is $\boxed{60}$