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A small painting has an area of 400 cm^2. The length is 4 more than twice the width. Find the dimensions of the pool. Solve by completing the square. Round answers to the nearest tenth.
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A small painting has an area of 400 cm^2. The length is 4 more than twice the width. Find the dimensions of the pool. Solve by completing the square. Round answers to the nearest tenth.

User JohnWrensby
by
8.0k points

1 Answer

5 votes
A = l*w
l = 2w + 4
400 = (2w + 4)*w
0 = 2w^2 + 4w - 400

Then use the quadratic equation where a=2, b=4, and c=-400.

w = 13.2
l = 30.4



User Seanmcl
by
8.3k points
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