Question 668176
{{{ (2r-5)^2=81 }}}


{{{sqrt((2r - 5)^2) = _+- sqrt(81)}}} ----- Taking square root of both sides


{{{2r - 5 = _+- 9}}}


2r - 5 = 9_____2r = 14______r = {{{14/2}}}, or {{{highlight_green(7)}}}


2r - 5 = - 9_____2r = - 4______r = {{{(- 4)/2}}}, or {{{highlight_green(- 2)}}}


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