Question

for what value of k the root of equation x^2+4x+k=0 are real
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Answer 1

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

b2−4ac≥0⟹b2≥4ac

⟹16≥4k⟹k≤4

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Answer 2

Answer:

x^2+4x+k=0

no it's a not real