a - [ b - { c - ( a - b - c )}] help me -
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Answer:
2c
Rule:
if there is a minus sign before a bracket then the sign of all the terms in the bracket becomes opposite (ie. plus becomes minus and minus becomes plus). Also if there is no sign before a term assume (by convention), it is having a plus sign.
Step-by-step explanation:
a - [ b - {c - (a - b - c)}]
= a - {b - (c - a + b + c)}
= a - (b - c + a - b - c)
= a - b + c - a + b + c
= (a - a) + (-b + b) + (c + c)
= 0 + 0 + 2c
= 2c
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