Question

for what value of k the root of equation xsquare+4x+k are real​

Answer 1

For a Quadratic Equation ax2+bx+c=0 to have real roots 

b2−4ac≥0⟹b2≥4ac

⟹16≥4k⟹k≤4

Answer 2

Answer:

For a Quadratic Equation ax

2

+bx+c=0 to have real roots

b

2

−4ac≥0⟹b

2

≥4ac

⟹16≥4k⟹k≤4