Question 1200822
the length of a rectangular platform is 2 feet longer than three times its width.
L = 3w + 2 
the area of the platform in 56 square inches.
L*W = 56
what are the width and the length of the platform
Replace L with (3w+2) 
(3w+2)*w = 56
distribute w
3w^2 + 2w = 56
a quadratic equation
3w^2 + 2w - 56 = 0
You can use the quadratic formula but this will factor
(3w+14)(w-4) = 0
the positive solution is all we want here
w = 4 is the width
then
L = 3(4)+2
L = 14 is the length