SOLUTION: a page with length 3 inches more than its width, has 80 square inches of printed area. the margins at the top and bottom are each 1 inch wide. Find the dimension of the page
Let w be the page width, in inches.
Then its length is (w+3) inches.
The printed area has dimensions in 2 = 1 + 1 inches less. Therefore, the equation for the printed area is
(w-2)*(w+1) = 80.
w^2 -w - 82 = 0.
Solve it using the quadratic formula.