Question

A photo is printed on an 11-inch by 13-inch piece of paper. The photo covers 80 square inches and has a uniform border. What is the width of the border?

Answer 1

the width of the border is w=1.5 in

Explanation:

Answer 2

Let
w--------> width of the border

we know that
(11-2w)*(13-2w)=80--------> 11*13-22w-26w+4w²=80
143-48w+4w²-80=0
4w²-48w +63=0

using a graph tool------> to resolve the second order equation
see the attached figure

the solution are
w1=1.5
w2-10.5--------> is not solution

the answer is
the width of the border is w=1.5 in