Question 1189225
Dimensions of the pool, 2x and x
Pool upper surface's area, 2x^2


Dimensions for the OUTER part of bordering walkway , 2x+2*1 and x+2*1


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The combined area of the pool and the walkway is 400 square feet.
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{{{cross((2x+1)(x+1)=400)}}}
{{{highlight_green((2x+2*1)(x+2*1)=400)}}}


Not this -----
{{{cross(2x^2+3x+1=400)}}}

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{{{cross(x=6.352)}}}--------<s>the width</s>