Question 444323
{{{x^2+9x-36=0}}}....factor it...replace {{{9x}}} with {{{-3x+12x}}}

{{{x^2-3x+12x-36=0}}}.....group

{{{(x^2-3x)+(12x-36)=0}}}

{{{x(x-3)+12(x-3)=0}}}

{{{(x+12)(x-3)=0}}}

{{{x+12=0}}} if {{{x=-12}}}

{{{x-3=0}}}  if {{{x= 3}}}


{{{ graph( 500, 500, -24, 24, -60, 25, x^2+9x-36) }}}