Question 211938
The discriminant in this equation is:
{{{(8^2-4(1)(16)) = 0}}}
When the discriminant is zero, the equation has a double root.
{{{x^2+8x+16 = 0}}} Factor.
{{{(x+4)(x+4) = 0}}} so...
{{{x = -4}}} or {{{x = -4}}} a double root.
{{{graph(400,400,-10,5,-5,5,x^2+8x+16)}}}