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The width of a painting is 4 inches less than the length , and the surface area is 320 square inches. Find the length.
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The width of a painting is 4 inches less than the length , and the surface area is 320 square inches. Find the length.

User John Stauffer
by
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2 Answers

2 votes
The length is 20 inches. 20 times 16 equals 320 so the length is 20 inches and the width is 16.
User Kokulan
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5 votes
320 = L * (L - 4)
320 = L^2 -4l
L^2 - 4L - 320
Use quadratic formula

W = (-b+- sqrt(b^2 - 4ac))/2a
W = -20 and 16

The width can’t be negative so width = 20inches
User Lulylulu
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