SOLUTION: a 20-ft by 40-ft swimming pool is surrounded by a deck d feet wide. What is the area of the deck?

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Question 311473: a 20-ft by 40-ft swimming pool is surrounded by a deck d feet wide. What is the area of the deck?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
a 20-ft by 40-ft swimming pool is surrounded by a deck d feet wide. What is the area of the deck?
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"area of pool and deck" - "area of pool"
(2d+20)(2d+40) - (20)(40)
4d^2+80d+40d+800 - 800
4d^2+120d+800 - 800
4d^2+120d
4d(d+30) (square feet)