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Ted is building a square-shaped deck around a tree in his backyard. The empty area which holds the tree is in the shape of a square with a side length of 5 feet, and the deck has a side length that is x ft longer.Which of the following inequalities could be used to solve for x if Ted wants the area of the deck to be at least 96 square feet? A. x2 + 10x + 96 > 0 B. x2 + 10x - 96 < 0 C. x2 + 10x - 96 > 0

Question

Ted is building a square-shaped deck around a tree in his backyard. The empty area which holds the tree is in the shape of a square with a side length of 5 feet, and the deck has a side length that is x ft longer.Which of the following inequalities could be used to solve for x if Ted wants the area of the deck to be at least 96 square feet? A. x2 + 10x + 96 > 0 B. x2 + 10x - 96 < 0 C. x2 + 10x - 96 > 0

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Solution

The area of the square deck is given by the formula (side length)^2. Since the side length of the deck is 5 feet plus x feet, the area of the deck is (5+x)^2.

Ted wants the area of the deck to be at least 96 square feet, so we set up the inequality (5+x)^2 >= 96.

Expanding the left side of the inequality gives 25 + 10x + x^2 >= 96.

Subtracting 96 from both sides gives x^2 + 10x - 71 >= 0.

So, none of the given options A, B, or C are correct. The correct inequality should be x^2 + 10x - 71 >= 0.

This problem has been solved

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