The length of a rectangle is 3 centimeters less than twice its width its area is 20 square centimeter. Find the dimensions of the rectangle. use the formula, area=length*width.

Question

zpupster · Answer

write down what you know.

area  is 20 m2
20 =
width we dont kno so let that be w
our length 3 less than 2 times the width
-3 + 2w =2w-3

our equation 
20 = (w)(2w-3)
20 = 2w^2-3w
2w^2- 3w - 20 = 0
2w^2 - 8w - 5w - 20 = 0
2w(w-4)+5(w-4) = 0
(2w+5)(w-4)=0

w-4=0
w=4
l=2w-3
l=8-3
l=5
check
20 = 5(4)

anonymous · Answer

Thank you so much!!!! =]