1. ## geometry problem

the area of a rectangle of legthx is given by 3x^(2) + 5x. find the width of the rectangle
Is this set up correct?
2x+2(3x^(2) +5x)= perimeter

2. No!
Let $y$ be the width. Then the area is $xy$.
We have $xy=3x^2+5x\Leftrightarrow xy=x(3x+5)\Leftrightarrow y=3x+5$