<PRE><B>Question 195428</B>
What is the perimeter? It is the sum of the 4 sides. So
{{{(x+2) + (2x+1) + (x^2-3x) + (x-5) = 88}}}
Simplify
{{{x^2 + x -2 = 88}}}
{{{x^2 + x -90 = 0}}}
{{{(x +10)(x-9)=0}}}
So x = -10 or 9. Since  the length cannot be negative, then x = 9

SO the sides are:
x+2 = 9+2 = 11
2x+1 = 18+1 = 19
x^2-3x = 81-27 = 54
x-5 = 4</PRE>