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Which variable expression describes the area of the shaded region in the diagram shown below ?

Which variable expression describes the area of the shaded region in the diagram shown-example-1
User Jefflovejapan
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Answer: B

Explanation:

The area of entire rectangle is (9)(4)=36.

The area of the square inside is
x(x)=x^2

Subtracting the areas, we get
36-x^2

User DaemonThread
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