SOLUTION: The width of a rectangle is 5 meters less than its length. The area is 84 square meters.What is the length of the rectangle? w=x-5 l=x x(x-5)=84 x^2-5x=84 x^2-5x-84=0 x

Algebra ->  Rectangles -> SOLUTION: The width of a rectangle is 5 meters less than its length. The area is 84 square meters.What is the length of the rectangle? w=x-5 l=x x(x-5)=84 x^2-5x=84 x^2-5x-84=0 x      Log On


   

Question 350438: The width of a rectangle is 5 meters less than its length. The area is 84 square meters.What is the length of the rectangle?
w=x-5
l=x
x(x-5)=84
x^2-5x=84
x^2-5x-84=0
x=5+√25+336
x=5+19 or x=5-19
x=24/2 or x=-14/2
x=12 or x= -7(NO can't be negative)
L=12





Answer by kicker1238(2) About Me  (Show Source):
You can put this solution on YOUR website!
let width be: x-5
Let length be: x
x(x-5)=84
x^2-5x=84
x^2-5x-84=0
x=5+√25+336
x=5+19 or x=5-19
x=24/2 or x=-14/2
x=12 or x= -7(NO can't be negative)
L=12