(15-12x²)/(3+x)=(5x+12)/(x+3);
(15-12x²)/(3+x) - (5x+12)/(x+3) = 0;
(15-12x²-(5x+12))/(x+3)=0;
(15-12x²-5x-12)/(x+3)=0;
(-12x²-5x+3)/(x+3)=0;
-12x²-5x+3=0;
D = 25-4*(-12)*3=25+144=169>0;
x1=(5-13)/(-24)=-8/24=-1/3;
x2=(5+13)/(-24)=-18/24=-3/4.
x+3≠0;
x≠-3.
Ответ: - 1/3; - 3/4.
(15-12x²)/(3+x)=(5x+12)/(x+3);
(15-12x²)/(3+x) - (5x+12)/(x+3) = 0;
(15-12x²-(5x+12))/(x+3)=0;
(15-12x²-5x-12)/(x+3)=0;
(-12x²-5x+3)/(x+3)=0;
-12x²-5x+3=0;
D = 25-4*(-12)*3=25+144=169>0;
x1=(5-13)/(-24)=-8/24=-1/3;
x2=(5+13)/(-24)=-18/24=-3/4.
x+3≠0;
x≠-3.
Ответ: - 1/3; - 3/4.