SOLUTION: The length of a rectangle is 3cm more than the width. The area is 70cm^2. Find the dimensions of the rectangle.

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Question 632612: The length of a rectangle is 3cm more than the width. The area is 70cm^2. Find the dimensions of the rectangle.
Answer by art123(8) About Me  (Show Source):
You can put this solution on YOUR website!
let width=x
then length=3+x
area=length*width
therefore area=x*(x+3)
given area=70cm^2
70=x^2+3x
x^2+3x-70=0
x^2+10x-7x-70=0
x(x+10)-7(x+10)=0
(x+10)(x-7)=0
(x-7)=0
therefore x=7
ignore x=-10 as it is negative value
therefore width=7cm
length=7+3=10cm