Question

find the value of k the root of the equation x^2+4x+k=0 are real​

Answer 1

$\large{\implies{Answer}}$

for real roots the condition is

$b {}^{2} - 4ac = 0$

$(4) {}^{2} - 4(1)(k) = 0 \\ 16 - 4k = 0 \\ - 4k = - 16 \\ k = \frac{ - 16}{ - 4}$

$\large{\implies{\blue{k=4}}}$