Final answer:
The value of ab + 2c when a = 3, b = 2, and c = -4 is -2.
Step-by-step explanation:
To evaluate ab + 2c when a = 3, b = 2, and c = -4, we substitute these values into the expression.
ab + 2c = (3)(2) + 2(-4) = 6 - 8 = -2.
Therefore, ab + 2c equals -2.