Question 68265
y = -x^2 + 8x - 12
-y = x^2 - 8x + 12
-y - 12 = x^2 - 8x
-y - 12 + 16 = (x - 4)^2
-y + 4 = (x - 4)^2
-y = (x - 4)^2 - 4
y = -(x - 4)^2 + 4
{{{graph(300,300,-3,8,-4,4,-(x - 4)^2 + 4)}}}{{{graph(300,300,-3,8,-4,4,-x^2 + 8x - 12)}}}