If a,b,c are the sides of the triangle ABC such that x²-2(a+b+c)x+3k(ab+bc+ac)=0 has real roots,then range of k???

Question

It's the topic of quadratic equation....

Answer 1

(-2(a + b + c))² - 4(1)(3k(ab + bc + ac)) > 0

 

Solve for k