Question 1080571


{{{ y=9(x+4)^2-81 }}}
{{{ y=-9(x+4)^2+81 }}}

{{{ 9(x+4)^2-81 =-9(x+4)^2+81}}}.......

{{{ 9(x^2 + 8 x + 16)-81 =-9(x^2 + 8 x + 16)+81}}}

{{{ 9 x^2 + 72x + 63 = -9 x^2 - 72x - 63}}}

{{{ 9 x^2 + 72x + 63 +9x^2 +72x +63=0}}}

{{{ 18 x^2 + 144x + 126=0}}}

{{{ 18 (x^2 + 8x + 7)=0}}}

{{{ 18 (x^2 + x+7x + 7)=0}}}

{{{ 18 ((x^2 + x)+(7x + 7))=0}}}

{{{ 18 (x(x + 1)+7(x + 1))=0}}}

{{{18 (x + 1) (x + 7) = 0}}}
solutions:

{{{x = -7}}}, => {{{ y = 0}}}-> point ({{{highlight( -7)}}},{{{highlight(0)}}})
and
{{{x = -1}}}, =>{{{y = 0}}}-> point ({{{highlight( -1)}}},{{{highlight(0)}}})