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Let f(x)=x^2+6x+1, and let R denote the set of points (x,y) in the coordinate plane such that f(x)+f(y)≤0 and f(x)−f(y)≤0. Find the area of R

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 Feb 6, 2020
 #1
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What is f(y) defined?

 Feb 7, 2020

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