The identity a2 - b2 equals:
A(a+b)(a+b)
B(a-b)(a-b)
C(a+b)(b-a)
D(a+b)(a-b)
Answer & Solution
Correct answer: D. (a+b)(a-b)
1. The left side is a difference of two squares.
2. It factors into two linear brackets.
3. So a2 - b2 is (a + b)(a - b).
4. The answer is (a+b)(a-b).
_Source: NCERT Class 9 Mathematics, Ch 4 'Exploring Algebraic Identities'_
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