SOLUTION: I have this problem that says simplify 5[42-(10-90)] i came up with 610 and I'm not so sure its right can someone help me thanks

Question 250701: I have this problem that says simplify
5[42-(10-90)]
i came up with 610 and I'm not so sure its right can someone help me thanks
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
Here is the original equation:
5[42-(10-90)]
---
Using order of operations, 10-90 first.
5[42-(-80)]
---
a double negative is positive. So,
5[42+80]
---
Now, we simplify the (_)
5[122]
---
Finally multiply to get 610.
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