Question 660766
{{{3*sqrt(9+x)=15}}}


{{{sqrt(9+x)=15/3}}}


{{{sqrt(9+x)=5}}}


{{{9+x=5^2}}}


{{{9+x=25}}}


{{{x=25-9}}}


{{{x=16}}}


So the solution is {{{x=16}}}

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Check:


{{{3*sqrt(9+x)=15}}}


{{{3*sqrt(9+16)=15}}}


{{{3*sqrt(25)=15}}}


{{{3*5=15}}}


{{{15=15}}}


So the answer is verified.


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