Question 43676
{{{y = x^2 - x - 20}}}
{{{0 = (x - 5)(x + 4)}}}
{{{x - 5 = 0}}} and {{{x + 4 = 0}}}
{{{x = 5}}} and {{{x = -4}}}
{{{ graph( 600, 600, -10, 10, -10, 10, x^2 - x - 20 ) }}}