w (w+14) = 1472
w^2 + 14 w - 1472 = 0
w = [-14 +/- sqrt(196+5888) ]/2
w = [-14 +/- 78]/2
want positive w so
w = 32
then l = 32+14 = 46
The floor of a one-story building is 14 feet longer than it is wide (see figure). The building has 1472 square feet of floor space.
a) Write a quadratic equation for the area of the floor in terms of w.
(b) Find the length l and width w of the floor.
1 answer
1 answer