For what value of k the root of the equation x2+4x+k=0 are real

1.	For what value of k the root of the equation x2+4x+k=0 are real
Answer» b²-4ac=0. 4²-4×1×k=0. 16-4k=0. 16=4k. 16÷4=k . 4=k. Value of k must be less or equal to 4

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