ANSWERS: 2
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(7a^3 - 2a^2 +6) - (7a^2 + 2a-4) Open up the brackets 7a^3 - 2a^2 +6 - 7a^2 - 2a +4 Notice the negative on the second bracket is multiplied to *every* term inside the second bracket. Now it's just a simple matter of collecting like terms and simplifying. Off you go...
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I got 2.
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