Question 1003035

{{{y=-(x+1)^2+3}}} when {{{y=9}}} 

{{{9=-(x+1)^2+3}}}

{{{9-3=-(x+1)^2}}}

{{{6=-(x+1)^2}}}

{{{(x+1)^2=-6}}}

{{{sqrt((x+1)^2)=sqrt(-6)}}}


{{{x+1=sqrt(-6)}}}

{{{x=sqrt(-6)-1}}}

{{{x=(-1+-i*sqrt(-6))}}}

solutions:

{{{x=(-1+i*sqrt(-6))}}}

{{{x=(-1-i*sqrt(-6))}}}