Question 697958

{{{18x^2-9x-9}}}

{{{9x^2-9x+9x^2-9}}}

{{{(9x^2-9x)+(9x^2-9)}}}

{{{9x(x-1)+9(x^2-1)}}}

{{{9x(x-1)+9(x-1)(x+1)}}}

{{{(x-1)(9x+9(x+1))}}}

{{{9(x-1)(x+x+1)}}}

{{{9(x-1)(2x+1)}}}

if we set it equal to zero we can solve for {{{x}}}

{{{9(x-1)(2x+1)=0}}}....since {{{9<>0}}} only {{{x-1=0}}} or {{{2x+1=0}}} or both will make equation true

so, if {{{x-1=0}}}....=>...than {{{x=1}}}

or if {{{2x+1=0}}}....=>...than {{{x=-1/2}}}


see it on a graph:

{{{ graph( 600, 600, -5, 5, -15, 10, 9(x-1)(2x+1)) }}}