A rectangular pool is twice as long as the it is wide and has a 10 foot walkway surrounding it. If the border has an area of 2800 ft^2 find the perimeter of the pool

so the Length of the border will be 2x+20 and the width be x+10

I have figured out x=40 and the perimeter to equal 240ft? I set my equation to be x^2+10x=1400

Not sure it that is correct?

Hi IDontunderstand,

That's what I got. I used the total area of the pool with the walkway, then subtracted the area of the pool to equal the area of the walkway alone. Like this,





The pool is 40 X 80 with a perimeter of 240.

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