Question 1134252
For what values of the variable does the following expression make sense:

a. {{{sqrt(8c)}}}

The domain of the square root function is ({{{0}}}, {{{infinity}}}).

so,  {{{sqrt(8c)}}} will  make sense only if {{{c>=0}}}

b. {{{sqrt(-10b) }}}

if {{{b}}} is negative or {{{b<= 0}}}, than{{{ -10b}}} will be positive and {{{sqrt(-10b) }}} will  make sense