Question 821529
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
ABCD is a rectangle. find the length of BD, 
if AC=2x+1 and BD=x+8, rectangle, diagonals AC and BD are equal
  2x+ 1 = x+ 8
     x = 7  and BD = 15   (x+8)
{{{drawing(400,400,-2.5,2.5,-2.5,2.5, 
locate(-2.1,-1,B), locate(-2,1.2,A), locate(2,1.1,D), locate(2,-1,C),
green(line(-2,-1,2,1), line(-2,1,2,-1)),
line(-2,1,-2,-1), line(-2,-1,2,-1), line(2,-1,2,1), line(2,1,-2,1) )}}}