Question 82056
You apply the distance formula:{{{d = sqrt((x[2]-x[1])^2+(y[2]-y[1])^2)}}}
The two given points are:
(10, 0) and (-10, 0) so...
{{{x[1] = 10}}}, {{{y[1] = 0}}} and
{{{x[2] = -10}}}, {{{y[2] = 0}}}
Making the appropriate substitution:
{{{d = sqrt((-10-10)^2+(0-0)^2)}}}
{{{d = sqrt((-20)^2)}}}
{{{d = sqrt(400)}}}
{{{d = 20}}}