Question

If the roots of the quadratic equation $ x^2 + 4x + k = 0 $ are real and equal, then the value of $ k $ is:

• A. 2
• B. 4
• C. 8
• D. 16

Hint:

Key Fact: A quadratic equation has equal roots if \( D = 0 \), i.e., \( b^2 = 4ac \)