Question 928029
y = (x-9)^2
(x-9)(x-9) = 0
x^2 - 18x + 81 = 0
<font size=3 color="red">F</font>	First terms
<font size=3 color="red">O</font>	Outside terms
<font size=3 color="red">I</font>	Inside terms
<font size=3 color="red">L</font>	Last terms
{{{drawing(300,300,   -10,10,-10,10,  blue(line(9,10,9,-10))  ,  
 grid(1),
circle(9,0,0.4),
graph( 300, 300, -10,10,-10,10,0, x^2 - 18x + 81 ))}}}