Question 560958
{{{ x^2 + 4x - 5 = 0 }}}
Here's the plot:
{{{ graph( 400, 400, -10, 10, -10, 10, x^2 + 4x - 5) }}}
It looks like the roots are 
{{{ x = 1 }}} and
{{{ x = -5 }}}
check answers:
Rewrite these as:
{{{ x - 1 = 0 }}} 
{{{ x + 5 = 0 }}}
Multiplying:
{{{ ( x - 1 )*( x + 5 ) = x^2 - x + 5x - 5 }}}
{{{ ( x - 1 )*( x + 5 ) = x^2 + 4x - 5 }}}
OK