SOLUTION: A CROSS-SECTIONAL AREA OF A RECTANGLE DUCT IS 240 SQ. IN.IF THE LENGTH IS 5 INCHES LESS THANT TWICE THE WIDTH, WHAT IS THE LENGTH OF EACH SIDE/
Algebra ->
Surface-area
-> SOLUTION: A CROSS-SECTIONAL AREA OF A RECTANGLE DUCT IS 240 SQ. IN.IF THE LENGTH IS 5 INCHES LESS THANT TWICE THE WIDTH, WHAT IS THE LENGTH OF EACH SIDE/
Log On
Question 1077165: A CROSS-SECTIONAL AREA OF A RECTANGLE DUCT IS 240 SQ. IN.IF THE LENGTH IS 5 INCHES LESS THANT TWICE THE WIDTH, WHAT IS THE LENGTH OF EACH SIDE/ Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! width is x
length is 2x-5
their product is 240
x(2x-5)=240=2x^2-5x
2x^2-5x-240=0
x=(1/4)(5+/- sqrt (25+1920)); sqrt 1945=44.10
x=(1/4)(49.10)=12.28 in
2x-5=19.55 in length
product is 240.074, 240 within rounding error
