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  1. The term, that should be added to (4x² + 8x) so that resulting expression be a perfect square, is
    1. 2
    2. 4
    3. 2x
    4. 1
Correct Option: B

(a + b)² = a² + 2ab + b²
∴ 4x² + 8x + 4
= (2x)² + 2 × 2x × 2 + (2)²
= (2x + 2)²
∴ Required number = 4


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