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If the function $j(x)$ is defined only on domain $[-1,2]$, and is defined on this domain by the formula $$j(x) = 2x^2+7,$$ then what is the range of $j(x)$? Express your answer as an interval or as a union of intervals.

 Aug 18, 2021
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The range of j(x) is [9,15].

 Aug 19, 2021

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