({left( {x - 5} right)^2} - xleft( {x + 2} right) = 5)
Giải chi tiết:
(begin{array}{l}{left( {x - 5} right)^2} - xleft( {x + 2} right) = 5\ Leftrightarrow left( {{x^2} - 10x + 25} right) - left( {{x^2} + 2x} right) = 5\ Leftrightarrow {x^2} - 10x + 25 - {x^2} - 2x = 5\ Leftrightarrow - 12x = - 20\ Leftrightarrow x = dfrac{5}{3}end{array})
Vậy (x = dfrac{5}{3}).
Chọn C.