Question 1207564
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We can work the problem "backwards": start with the square of side length x, then increase one dimension by 4m and decrease the other by 4m to get a rectangular playground with area 153 m^2.<br>
{{{(x-4)(x+4)=153}}}
{{{x^2-16=153}}}
{{{x^2=169}}}
{{{x=13}}}<br>
ANSWER: the side length of the square is 13m<br>
CHECK: (x-4)(x+4) = (13-4)(13+4) = 9*17 = 153<br>