Question

(-2-4)*8 help me solve this

Answer 1

PEMDAS  (the correct order of operations) starts with ' P '. 
That tells you to take care of anything that's inside parentheses
before you move out of the parentheses and do anything else.

(-2-4) is  (-6), and the the whole problem is then simply  -6 * 8 .

I'm pretty sure you can handle it from there.