Question 82127
1) Solve bycompleting the square:
{{{p^2-8p = 0}}} Add the square of half the x-coefficient ({{{(-8/2)^2 = 16}}}) to both sides.
{{{p^2-8p+16 = 16}}} Factor the left side.
{{{(p-4)(p-4) = 16}}} or
{{{(p-4)^2 = 16}}} Take the square root of both sides.
{{{p-4 = 4}}} or {{{p-4 = -4}}} 
{{{p = 8}}} or {{{p = 0}}}

2) Solve by graphing:
{{{x^2+6x-2 = 0}}}
{{{graph(300,200,-10,5,-15,5,x^2+6x-2)}}}
You can estimate the roots from the graph as:
x = -6.3 and x = 0.3