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Let f (x) = x ^(2) + 6x + 1 and let R ...

Let `f (x) = x ^(2) + 6x + 1 ` and let R denotes the set of points (x,y) in the coordinate plane such that ` f (x) +f (y) ` so and `f (x) - f (y) le 0.` Which of the following is closest to the area of R?

A

22

B

23

C

24

D

25

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The correct Answer is:
D
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