SOLUTION: If the length of a rectangle is 2 km longer than twice the width, then what is the length if the area is 60 square kilometer?

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Question 189626: If the length of a rectangle is 2 km longer than twice the width, then what is the length if the area is 60 square kilometer?
Answer by jonvaliente(64) About Me  (Show Source):
You can put this solution on YOUR website!
Let x=width of the rectangle
2x+2=length of the rectangle
If Area=length x width
x%2A%282x%2B2%29=60
2x%5E2%2B2x=60
2x%5E2%2B2x-60=0
%282x%2B12%29%28x-5%29=0
2x+12=0 and x-5=0
2x+12-12=0-12
2x=-12
x=-6, but the width cannot be negative
x-5=0
x-5+5=0+5
x=5, width is 5km
2(5)+2=12km
The length of the rectangle is 12km