Question Paper
Class / Subject: Class 8 (ICSE) · Mathematics
Chapter: Chapter 12 — Chapter 12: Algebraic Identities
Time Allowed: 32 minutes
Max Marks: 16
1. What is (a+b)²? [1]
(A) a² + 2ab + b²
(B) a² + b²
(C) a² - 2ab + b²
(D) 2a + 2b
2. What is (a-b)²? [1]
(A) a² - 2ab + b²
(B) a² + b²
(C) a² + 2ab + b²
(D) 2a - 2b
3. What is (a+b)(a-b)? [1]
(A) a² - b²
(B) a² + b²
(C) a² + 2ab
(D) 2a - 2b
4. Using (a+b)², what is 102² (as 100+2)? [1]
(A) 10404
(B) 10004
(C) 10204
(D) 10024
5. What is (x+3)²? [1]
(A) x²+6x+9
(B) x²+9
(C) x²+3x+9
(D) x²+6x
6. What is (x-2)²? [1]
(A) x²-4x+4
(B) x²+4
(C) x²-4x
(D) x²-2x+4
7. What is (x+5)(x-5)? [1]
(A) x²-25
(B) x²+25
(C) x²-10x
(D) x²+10x
8. Why use algebraic identities? [1]
(A) To simplify calculations quickly
(B) To confuse calculations
(C) No reason
(D) Only for tests
9. What is (a+b)²? [1]
(A) a² + 2ab + b²
(B) a² + b²
(C) a² - 2ab + b²
(D) 2a + 2b
10. What is (a-b)²? [1]
(A) a² - 2ab + b²
(B) a² + b²
(C) a² + 2ab + b²
(D) 2a - 2b
11. What is (a+b)(a-b)? [1]
(A) a² - b²
(B) a² + b²
(C) a² + 2ab
(D) 2a - 2b
12. Using (a+b)², what is 102² (as 100+2)? [1]
(A) 10404
(B) 10004
(C) 10204
(D) 10024
13. What is (x+3)²? [1]
(A) x²+6x+9
(B) x²+9
(C) x²+3x+9
(D) x²+6x
14. What is (x-2)²? [1]
(A) x²-4x+4
(B) x²+4
(C) x²-4x
(D) x²-2x+4
15. What is (x+5)(x-5)? [1]
(A) x²-25
(B) x²+25
(C) x²-10x
(D) x²+10x
16. Why use algebraic identities? [1]
(A) To simplify calculations quickly
(B) To confuse calculations
(C) No reason
(D) Only for tests