Question 120433
{{{y = x^2 - 4}}}
{{{y = (x + 2)(x - 2)}}}
set {{{y = 0}}} to find roots
{{{0 = (x + 2)(x - 2)}}}
The x-intercepts are the values of x that solve this
{{{x = 2}}}
{{{x = -2}}}
So, {{{P = -2}}} and {{{Q = +2}}}
The distance apart is {{{Q - P = 2 -(-2)}}}
{{{Q - P = 4}}} answer