Because two negatives cancel each other out, resulting in a positive.
Answer:
-83, -85
Step-by-step explanation:
-84 - 55
= -139
Here both have same sign (-) so u add and put the common sign(-) ....
So the answer is option B ( -139)...
Hope it helps!!!
The simplified expression of
is 
<h3>How to simplify the expression?</h3>
The expression is given as:

Expressions raise to power 0 is 1.
So, we have:

Apply the law of indices to expression with common base

Evaluate the sum and difference

Remove the bracket

Hence, the simplified expression of
is 
Read more about exponents at:
brainly.com/question/847241
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