Question

The length of a rectangle i 5 centimeters more than the width. The area of the rectangle is 36 square centimeters. What is the length?

Answer 1

Answer: 9 cm

Explanation:

l=length. A=area. w=width.

l*w=A

l*(l-5)=36 ==> w=l-5

l^2-5l=36

l^2-5l-36=0

l^2-9l+4l-36=0

l(l-9)+4(l-9)=0

(l+4)(l-9)=0

9*4=36

4=9-5 ==> w=l-5

l=9 cm