Calculation: - 2 (3a-4b)

Calculation: - 2 (3a-4b)

It's actually - 2x (3a-4b), but the multiplier sign is omitted
Negative x positive = negative, so - 2x3a = - 6A
Negative x negative = positive, so - 2x-4b = 8B
So the answer is: - 6A + 8b
Hope to help you