Question 87648
first, define the number to be, say, x


right then...
"seven less than a number" is written as: x-7: just think of 7 less than 10... we would say 3 because 10-7 is 3.


right then...
"square root of seven less than a number" is... {{{ sqrt(x-7) }}}


and finally...
"one eighth of the square root of seven less than a number" is... {{{ (1/8)sqrt(x-7) }}}


and this equals 2. So,
{{{ (1/8)sqrt(x-7) = 2 }}}
{{{ sqrt(x-7) = 16 }}}
Opposite (or reverse) of a square root is to square something, so square both sides:
{{{ (x-7) = 16^2 }}}
{{{ (x-7) = 256 }}}
{{{ x = 263 }}}


Hope this helps?


cheers
Jon.