Question 192147
{{{y=(x^2-20x+100)-100+10}}}
:
{{{y=(x-10)^2-90}}}
:
vertex is at (10,-90)
:
focus is at (10,-90 + 1/4) (10,89 3/4)(10,359/4)
:
directrix is at y=-90-1/4 =-90 1/4.....y=-361/4