Question 133948
Y=X^2-8X+9
{{{ graph( 300, 200, -6, 10, -10, 10, x^2 -8x +9) }}} (graph 300x200 pixels, x from -6 to 10, y from -10 to 10, x^2 -8x +9). 
MINIMUM VALUE FOR Y=(4,-7)