Question 1171583
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<pre>

<U>ANSWER</U>.  The dimensions are  3 units (the length) and 10 units (the width).  The perimeter is  3 + 10 + 3 + 10 = 26 units.



<U>Solution</U>


    x*(x+7) = 30

    x^2 + 7x - 30 = 0

    (x-3)*(x+10)  = 0


The roots are 3 and -10, and only positive root works.


It is 3 units, the width.
</pre>

Solved.


The solution can be guessed mentally in 2 seconds.


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