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OpenStudy (anonymous):
Which of the following parabolas opens upward and appears narrower than y = −3x2 + 2x − 1? y = 4x2 − 2x − 1 y = −4x2 + 2x − 1 y = x2 + 4x y = −2x2 + x + 3
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OpenStudy (tkhunny):
Just look at the leading coefficient. Positive Up Negative Down. Can you eliminate some based on this concept?
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