Question 729512

you tried this:

{{{(x+9)^2=64}}} 
{{{x^2+81=64}}}..this is incorrect {{{(x+9)^2=x^2+18x+81}}} not {{{x^2+81}}}

try it this way:

{{{(x+9)^2=64 }}}

{{{(x+9)^2=8^2 }}}....since exponents same, bases are same to, so we have

{{{(x+9)=8 }}}.....solve for {{{x}}}

{{{x=8-9 }}}

{{{x=-1 }}}

check:

{{{(-1+9)^2=64 }}}

{{{(8)^2=64 }}}

{{{64=64 }}}