
Kenneth S. answered 04/18/16
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
You need to draw a rectangle that has dimensions 12+2x by 20+2x, representing the widening of original garden's length & width.
The above gives you an area of a bigger rectangle; now subtract the area of the rose garden (12 by 20 ft). This difference is the area of the added walking path. Set that equal to 68 SQUARE FEET.
You now have a quadratic equation--you can solve it.