Подстановка условия
[src](13 - 5*m)^2 - (12 - 4*m)^2 + 4*m при m = 1/2
(13 - 5*m)^2 - (12 - 4*m)^2 + 4*m
4m+−(−4m+12)2+(−5m+13)2 (13 - 5*(1/2))^2 - (12 - 4*(1/2))^2 + 4*(1/2)
4(1/2)+−(−4(1/2)+12)2+(−5(1/2)+13)2 (13 - 5/2)^2 - (12 - 4/2)^2 + 4/2
24+−(−2+12)2+(−25+13)2