[(-5 z^2-11 z-12) - (9 z^2-34 z+2)] - (-20 z^2+38 z-24)
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[(-5 z^2-11 z-12) - (9 z^2-34 z+2)] - (-20 z^2+38 z-24)

[From: ] [author: ] [Date: 11-12-05] [Hit: ]
......
need help to solve what do the brackets mean[]

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the bracket means we have to solve first the quantity inside this grouping symbol. bracket is used not to overuse parenthesis (since parenthesis is already use.)
[(-5 z^2-11 z-12) - (9 z^2-34 z+2)] operate on this first, then the result in simplifying this will used together with the third given.

(-14z^2 + 23z -14) - (-20 z^2+38 z-24)

6z^2- 15z 10

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6 z^2 - 15z +10

just distribute the "-" signs and expand and simplify
1
keywords: 24,34,12,11,38,20,[(-5 z^2-11 z-12) - (9 z^2-34 z+2)] - (-20 z^2+38 z-24)
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