The expansion of (a - b)2 is:
Aa2 - 2ab - b2
Ba2 + 2ab - b2
Ca2 - 2ab + b2
Da2 + 2ab + b2
Answer & Solution
Correct answer: C. a2 - 2ab + b2
1. The identity mirrors the one for (a + b)2.
2. Only the sign of the middle term changes.
3. So (a - b)2 is a2 - 2ab + b2.
4. The answer is a2 - 2ab + b2.
_Source: NCERT Class 9 Mathematics, Ch 4 'Exploring Algebraic Identities'_
Related questions
After taking out 2, the expression 25p2 + 30pq + 9q2 is the square of:Expanding (a + b + c)2 gives how many squared terms?Who proposed the identity used to compute squares quickly in 750 CE?Using a2 - b2, the value of 51 squared minus 49 squared is:In (x + a)(x + b), the constant term is:In (x + a)(x + b), the coefficient of x is:(a + b)2 is verified using which property?An identity differs from an equation because it holds for: