Question

Помогите умоляю (d2-13)2-(d-77)2=0

Answer 1

$(d^2-13)^2-(d-77)^2=0\(d^2-13-d+77)(d^2-13+d-77)=0\(d^2-d+64)(d^2+d-90)=0\\d^2-d+64=0\D=-255<0\\d^2+d-90=0\D=361=19^2\d_1=9\d_2=-10$

Ответ: -10; 9