Chapter 4 - Section 4.2 - Adding and Subtracting Polynomials - 4.2 Exercises - Page 286: 88

$P=(4x^2+16x+2) \text{ units}$

Using $P=2w+2l$, then the perimeter of the given rectangle is \begin{array}{l}\require{cancel} P=2(2x^2+5x-3)+2(3x+4) \\\\ P=4x^2+10x-6+6x+8 \\\\ P=4x^2+(10x+6x)+(-6+8) \\\\ P=(4x^2+16x+2) \text{ units} .\end{array}