SOLUTION: A rectangle with a length of x+4 and width of x+3, what is the perimeter of the rectangle if its area is 20cm^2? Thanks

Algebra ->  Rectangles -> SOLUTION: A rectangle with a length of x+4 and width of x+3, what is the perimeter of the rectangle if its area is 20cm^2? Thanks      Log On


   

Question 1167055: A rectangle with a length of x+4 and width of x+3, what is the perimeter of the rectangle if its area is 20cm^2?

Thanks
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
area is x^2+7x+12=20
so x^2+7x-8=0
(x+8)(x-1)=0
x=1 cm only positive root.
the sides are 4 cm and 5 cm
The perimeter is 18 cm.