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OpenStudy (anonymous):
Simplify (3a2 + 8a − 4) + (5a2 − 4).
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OpenStudy (unklerhaukus):
\[(3a^2 + 8a − 4) + (5a^2 − 4)\]\[=3a^2 + 8a − 4+ 5a^2 − 4\]\[=3a^2 + 5a^2 + 8a − 4+− 4\]\[=(\cdots)a^2+(\cdots)a+(\cdots)\]
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