SOLUTION: The width of a painting is 4 inches less than the length, and the surface area is 320 square inches. Find the leng
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Question 134416: The width of a painting is 4 inches less than the length, and the surface area is 320 square inches. Find the leng
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
What is the formula for the area of a rectangle? Area = length * width.
Let length = l.
Given: width = length - 4, Area = 320
l = -16 , l = 20.
Since the length cannot be negative, the only solution that 'makes sense' is l = 20.
Check your answer. If l = 20, then width = 20-4 = 16. Is the area 320?
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