SOLUTION: The area of a restangular poster is 1400 square centimeters. If the width of the poster is 5 centimeters less than its height, find the dimensions of the poster.

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: The area of a restangular poster is 1400 square centimeters. If the width of the poster is 5 centimeters less than its height, find the dimensions of the poster.      Log On


   

Question 323600: The area of a restangular poster is 1400 square centimeters. If the width of the poster is 5 centimeters less than its height, find the dimensions of the poster.
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
im assume u meant rectangular.
A=1400
W=L-5
A=LW
1400=L%28L-5%29
1400=%28L%5E2-5L%29
0=L%5E2-5L-1400
0=%28L%5E2-40L%29%2B%2835L-1400%29
0=L%28L-40%29%2B35%28L-40%29
0=%28L%2B35%29%28L-40%29
cross%28-35=L%29,highlight%2840=L%29 cant be negative


W=L-5
W=40-5
highlight%28W=35%29