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posted by  Roger Will-Co on 8/22/2008 5:58:15 PM  |  status: Live  

!(....Roger Will-Co...needs help

Course Textbook Chapter Problem
Algebra N/A N/A N/A
Question Details:
The area, A, of a rectangle having length x is given by:
 
A= x + 36= x(x+10)
 
I need help finding the dimensions of the rectangle in meters.
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posted by chibba on 8/22/2008 6:19:53 PM  |  status: Live
Asker's Rating: Lifesaver   
Roger Will-Co's comment:
"thanks chibba"
Response Details:
A = x + 36 = x(x+10)                        simplify
 
A = x + 36 = x2 + 10x                 ignore the A for now
 
x + 36 = x2 + 10x                         minus x and 36 to both side
 
x2 + 9x - 36 = 0                           factor
 
(x + 12)(x - 3) = 0                        find x
 
x = -12, 3                                  the length should be positive
 
x = 3                                      plug into the oringal equation
 
A = 3 + 36 = 39                                    then divide by 3
 
3 x 13 = dimensions
 
                  
 
         
 
 
                  
 
 
Do not use L'Hopital's Rule on my post unless it's neccessary!
 
Feel free to msg me if you have any questions with my responses!
 
The indeterminate forms include 00, 0/0, 1∞, ∞ - ∞, ∞/∞, 0×∞, and ∞0.
Tags: Math, Algebra
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posted by DoktorD on 8/22/2008 6:20:13 PM  |  status: Live
Asker's Rating: Helpful   
Response Details:
All you have to do is solve for X and then plug it back into your equation...
 
 
Just do a little rearranging..
 
 
Just complete the square or do reverse FOIL or whatever you wanna call it...
 
That solve your problem?
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Oracle
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posted by A-Rod 7821 on 8/23/2008 5:32:15 PM  |  status: Live
Asker's Rating: Helpful   
Roger Will-Co's comment:
"Thanks A-Rod"
Response Details:
Given the area for a rectangle here, you need to find the values for x which are the dimensions of the rectangle.
Dimensions: 3 by 13
 
 
 
New York Yankees the best team in baseball without Brian Cashman!
Tags: Math, Algebra
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