y = - (x^2+36)/xy= -(x+36/x)=-x-36/xy'=-1+36/x^2-1+36/x^2=01-36/x^2=0(x^2-36)/x^2=0(x-6)(x+6)/x^2=0x=-6;x=6;x=0 - + + ------(-6)------(0)-----(6)----->x => x=6 - точка максимума V ^ ^ V
4(х+2)=х+6