Michael J. answered 02/01/17
Tutor
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Effective High School STEM Tutor & CUNY Math Peer Leader
We have to do PEMDAS.
First we take care of the term in outer parenthesis.
6 + [(5 - 7) - 4]
This has another set of parenthesis and one set of brackets.
Taking care of the parenthesis, we have
6 + [(-2) - 4]
Now, we take what is in the brackets.
6 + [-6]
This reduces to 0.
0 is the value of the outer parenthesis broken down. Multiply this value by -5.
-5(0) = 0