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 01-25-2007, 10:44 PM #1 Junior Member   Join Date: Oct 2006 Posts: 245 Blue Book Math Help i couldnt find this answer in bb math solution thread p.532 # 8 please help me it says the figure above shows the graph of a quadratic function f that has a minimum at the point (1,1) if f(b) = f(3), which of the following could be the value of b? Reply
 01-25-2007, 11:27 PM #2 Super Moderator   Join Date: Jun 2005 Location: Northeast Posts: 2,013 The line x=1 passing through the vertex of parabola is the line of symmetry. Symmetrical to x=3 in respect to x=1 is x=-1, so f(3) = f(-1), b=-1. In a "normal" language. f(3)=5 (see the graph), there are two points with y=5: (3,5) and (-1,5) (both marked!), f(-1) = 5 and b=-1 Reply
 01-26-2007, 12:10 AM #3 Junior Member   Join Date: Oct 2006 Posts: 245 wow.... am i stupid or what Reply
 01-26-2007, 12:13 AM #4 Junior Member   Join Date: Oct 2006 Posts: 245 Thank you so much tho Reply
 04-26-2013, 03:46 PM #5 New Member   Join Date: Feb 2013 Posts: 2 I answered the question based on the graph but what if the figure wasn't drawn to scale, is it possible to derive the equation of the parabola or solve this algebraically? Reply

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