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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 $$j(x) = 2x^2+1,$$ then what is the range of $j(x)$? Express your answer as an interval or as a union of intervals.

 

thanks!

WhichWitchIsWhich  Oct 29, 2017
 #1
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The parabola wll turn upward...it has a minimum value on the defined domain of 1

 

And the max  on the defined domain  is  2 (2)^2 + 1   =  9 

 

So......the range on the defined domain is  [ 1 ,9 ]

 

Here's the graph : https://www.desmos.com/calculator/apgmaihobm

 

 

cool cool cool

CPhill  Oct 29, 2017

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