Question 380974: I need help to simplify
-3[81-(68-98]=
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! your expression is:
-3*(81-(68-98))
You solve from the inner parentheses out.
The inner parentheses contain (68-98).
that equals (-30)
your expression becomes:
-3*(81-(-30))
you remove that inner parentheses to get:
-3*(81 + 30) because a minus times a minus gives a plus.
you solve the inner parentheses again to get:
-3*(111)
you remove that inner parentheses to get:
-333.
that's your answer.
you can use your scientific calculator to check your work.
you always solve the expression within the innermost set of parentheses first, then you solve the expression within the remaining innermost set of parentheses, etc. until you have no more sets of innermost parentheses to solve.
Your last set of innermost parentheses is the expression itself.
an expression of a*b is really an expression of (a*b) where the expression itself is within the innermost set of parentheses.
the expression of (a * (b+c)) contains (b+c) within the innermost set of parentheses.
once that's solved (let's call the result of (b+c) = d, then your expression becomes (a * d)
Once you resolve that, then you have your answer.
You should use () always, rather than [].
you showed your expression as:
-3[81-(68-98]
It should really have been shown as:
-3(81-(6-98))
Placing the proper number of parentheses surrounding the operation is crucial.
Even using the brackets as you did, you still needed to have that extra parentheses within as shown below:
-3[81-(68-98)]
Not having the correct number of parentheses in the right places will definitely throw you off.
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