Question 883022
ally wants to put a border around a 4x6 inch picture. She would like the border to be twice the 
area of the picture. What is the border width should Sally use (in inches)? 
--------
Draw the picture::
You have a rectangle inside a rectangle.
--------
The inner rectangle has area 4X6 = 24 in^2
---------------------
The ourter rectangle (including the inner) has area::
(6+2x)(4+2x) = 24 + 20x + 4x^2
----
The frame area = outer - inner = 4x^2 + 20x.
------
Equation: 
4x^2 + 20x = 2*24
x^2 + 5x - 12 = 0
x = [-5 +- sqrt(25-4*-12)]/2 = (-5+sqrt(73))/2 = 1.77 inches)
=============
Cheers,
Stan H.
---------------------