Home › CBSE Class 9 › Mathematics › Algebraic Identities › After taking out 2, the expression 25p2 + 30pq +…
After taking out 2, the expression 25p2 + 30pq + 9q2 is the square of:
A(5p - 3q)
B(3p + 5q)
C(5p + 9q)
D(5p + 3q)
Answer & Solution
Correct answer: D. (5p + 3q)
1. The first term is the square of 5p and the last of 3q.
2. The middle term is twice 5p times 3q, which is 30pq.
3. So the expression is (5p + 3q)2.
4. The answer is (5p + 3q).
_Source: NCERT Class 9 Mathematics, Ch 4 'Exploring Algebraic Identities'_
Related questions
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:Which identity helps compute 119 squared quickly?