A rectangular bedroom is 4 ft longer than it is wide. Its area is 140 ft2. What is the width of the room? ft

w=10ft

Step-by-step explanation:

You have a rectangle with an area of 140 square feet whose length (l) is 4 feet more than its width (w) and  knowing that rectangle area is base (b) by height (h) then:

but, l=w+4ft;

applying cuadratic equation

; where a=1, b=4 and c=-140

w1=10 and w=-14, we take w1 for being area values

finally:

width = 10 ft