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?
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?
Replies to: Blue Book Math Help
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