If x2 + 4x + 4 = 0, then the value of x is:

A - 2

B - 2 (repeated root)

C 2

D None of these

Solution

Correct Answer: Option B

দেওয়া আছে,
x2 + 4x + 4 = 0
⇒ x2 + 2. x. 2 + 22 = 0
⇒ (x + 2)2 = 0
⇒ (x + 2)(x + 2) = 0
∴  x = - 2 এবং x = - 2 [যেহেতু সমীকরণটি একটি দ্বিঘাত সমীকরণ তাই এর মূল হবে দুইটি]

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