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24 January, 07:03

The length of a rectangle is 4 units greater than its width, and the area of the rectangle can be expressed by the equation y = x2 + 4x. What is a reasonable domain for this function?

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  1. 24 January, 07:55
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    Hello:

    a reasonable domain for this function is : ]0; + ∞[

    because : x > 0 and x+4 > 0 ... f (x) = x (x+4) ... length * width
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