So, we first want to think about PEMDAS - parentheses (in this case, brackets first), exponents (that 2³), then multiplication division addition subtraction, from left to right.
First, we take a look at what's inside the bracket:
2³[(15-7)(4-2)] ← Solve the stuff inside the bracket first. Now, we look at parentheses, and solve the things inside the parentheses
2³[(8)(2)] ← Multiply them together since they are inside the bracket
2³[16] ← Now that the bracket is taken care of, we look at the exponent. 2³=8, so:
8*16 ← Now multiply...
The answer is 128
