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Anna007 [38]
3 years ago
14

Collin is building a deck on the back of his house. He has enough lumber for the deck to be 144 square feet. The length should b

e 10 feet more than its width.
What should the dimensions of the deck be?
Mathematics
1 answer:
joja [24]3 years ago
4 0
Width = x
length = x+10

Area of deck = 144 square feet

Area = length * width

144 = x(x+10)

Solving for x in a quadratic:

x²+10x = 144
x²+10x-144 = 0

Factor:
(x+18)(x-8) = 0

Solving for x:
x = 8, x = -18

Dimensions cannot be negative, therefore x = 8, only.

Length = x + 10
Length = 18

Width = 8
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