Question 202376
Looks like what you want is:
{{{sqrt(x-7)/8=2}}}
multiply both sides of the equation by 8 to get:
{{{sqrt(x-7) = 16}}}
square both sides of the equation to get:
{{{x-7 = 16^2}}}
which becomes:
{{{x-7 = 256}}}
-----
add 7 to both sides of the equation to get:
{{{x = 263}}}
-----
your answer should be x = 263.
-----
substitute in the original equation to prove the answer is good.
-----
{{{sqrt(263-7)/8 = 2}}} 
which becomes:
{{{sqrt(256)/8 = 2}}}
which becomes:
{{{16/8 = 2}}}
which becomes:
{{{2 = 2}}}
which is true so the answer is good.
the answer is:
x = 256