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The graph of the equation 2x2 + xy + y2 = 4 is the tilted ellipse pictured below; i.e. the points (x,y) in the plane that satisfy the equation yield the pictured ellipse.
(a) The upper piece of the ellipse (solid) is the graph of the function
(b) The lower piece (dashed) of the ellipse is the graph of the function
(c) There are two points indicated (as big dots) where the graphs of the functions in (a) and (b) "glue together". What is the x-coordinate of the right-most point?
(f)Simultaneously solving (e) with the original equation gives

Sagot :

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