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4 is the right answer so, you can
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Answer:
Option (d) is correct.
Step-by-step explanation:
Compare 2x²+8x+k=0 with ax²+bx+c=0, we get
a = 2, b = 8, c = k
Discreminant (D)=0
/* Roots are equal */
=> b²-4ac = 0
=> 8² - 4×2×k = 0
=> 64 - 8k = 0
/* Divide each term by 8, we get
=> 8-k = 0
=> -k = -8
=> k = 8
Therefore,
Option (d) is correct.
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