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So I'm doing this question and my answer is d(x)= 5 (x−3/10)^2 + 11/20. Now it's asking me to find the domain and range and also to graph the function of d. 

 Apr 28, 2019
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The Domain is just the "x" values of your graph, if your x-axis is going toward both left and right forever, the domain should be all real numbers.

The Range, is just where the y value is, and because this graph has a minimum vertex value, the y should just be greater or equal to the y value of the vertex.

 

SO your graph should look like 

So we can see that our graph stretches to both left and right forever, so the domain is d=R, or all real numbers

 

The vertex is at a minimum value, so the range or y value is {y>=0.55}

 Apr 29, 2019

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