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0 votes
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in Quadratic Equations by (31.2k points)
closed by

If the equation x2 + 4x + k = 0 has real and distinct roots, then

A. k < 4 

B. k > 4 

C. k ≥ 4 

D. k ≤ 4

1 Answer

+1 vote
by (30.8k points)
selected by
 
Best answer

If roots of given equation are real and distinct then D = b2 – 4ac > 0 

Here a = 1, b = 4 and c = k 

So, 

42 – 4 (1) (k) >0 

16 – 4k > 0 

16 > 4k 

K< 4

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