Решить пример
Sgrt 64 = 2^sgrt(13-x^2); 2^sgrt(13 - x^2) = 8; 2^ sgrt(13 - x^2) = 2^3; sgrt(13 - x^2) = 3; 13 - x^2 = 3^2; - x^2 = 9 - 13; x^2 = 4; x = - 2; x= 2.