SOLUTION: a rectangular garden 10 feet wide and 12 feet long is surrounded by a rock border of uniform width. the area of the garden and rock border combined is 168 square feet. what is the
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Question 304888: a rectangular garden 10 feet wide and 12 feet long is surrounded by a rock border of uniform width. the area of the garden and rock border combined is 168 square feet. what is the width of the rock border? Answer by checkley77(12844) (Show Source):
You can put this solution on YOUR website! (10+2x)(12+2x)=168
120+44x+4x^2-168=0
4x^2+44x-48=0
4(x^2+11x-12)=0
4(x+12)(x-1)=0
x-1=0
x=1 ft. ans. for the width of the rock border.
Proof:
(10+2*1)(12+2*1)=168
(10+2)(12+2)=168
12*14=168
168=168
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