x2 + 4x + 4 has which factor?
A(x + 4)
B(x - 2)
C(x - 4)
D(x + 2)
Answer & Solution
Correct answer: D. (x + 2)
1. Compare the expression with a2 + 2ab + b2.
2. Here a is x and b is 2.
3. So the expression is (x + 2)2, and (x + 2) is a factor.
4. The answer is (x + 2).
_Source: NCERT Class 9 Mathematics, Ch 4 'Exploring Algebraic Identities'_
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