<PRE><B>Question 181556</B>
yes the midpoint formula states that between any two points the midpoint is 
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((x1+x2)/2,(y1+y2)/2).....so the average of the x coordinates and the average of the y coordinates
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In this case we know what the midpoint is(point B).  What we are after is the other endpoint lets call it C=(x,y)
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so we have ((-4+x)/2=2 , (4+y)/2=8)
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-4+x=4
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x=8
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4+y=16
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y=12 
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so it would extend to C= (8,12)</PRE>