SOLUTION: the length of a rectangle is 4 cm greater than its width. the area of the rectangle is 20cm^2. calculate the length and width of the rectangle using algebra.

Question 362414: the length of a rectangle is 4 cm greater than its width. the area of the rectangle is 20cm^2. calculate the length and width of the rectangle using algebra.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
the length of a rectangle is 4 cm greater than its width. the area of the rectangle is 20cm^2. calculate the length and width of the rectangle using algebra.
..
width be w
length = w+4
...
area = L*W
w(w+4)=20
w^2+4w=20
w^2+4w-20=0
factorise by quadratic formula
b^2-4ac= 96

x1= 2.89cm

x2=-6.89 Ignore since negative
...
width = 2.89 cm
length = 6.89 cm
...
m.ananth@hotmail.ca
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