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Question (1)

QN009378

Which identity is used to factorise x 2 −25?

(A) (a+b) 2
(B) (a−b) 2
(C) a 2 −b 2 =(a+b)(a−b)
(D) a 3 +b 3

Correct Answer: C

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Question (2)

QN009379

Factorise a 2 +14a+49.

(A) (a+7) 2
(B) (a−7) 2
(C) (a+49)(a+1)
(D) (a+14) 2

Correct Answer: A

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Question (3)

QN009380

Which of the following is a perfect square trinomial?

(A) x 2 +5x+6
(B) x 2 +8x+16
(C) x 2 −7x+10
(D) x 2 +9x+14

Correct Answer: B

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Question (4)

QN009381

Factorise 49p 2 −81q 2 .

(A) (7p−9q) 2
(B) (49p−81q)(p+q)
(C) (7p+9q)(7p−9q)
(D) (7p−9q)(p−q)

Correct Answer: C

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Question (5)

QN009382

Which identity helps in factorising x 2 +2xy+y 2 ?

(A) (a+b) 2
(B) (a−b) 2
(C) a 2 −b 2
(D) a 3 +b 3

Correct Answer: A

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Question (6)

QN009383

Factorise m 2 −10m+25.

(A) (m+5) 2
(B) (m−5) 2
(C) (m−25)(m+1)
(D) (m−10) 2

Correct Answer: B

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Question (7)

QN009384

Which expression is factorised form of 16x 2 −y 2 ?

(A) (4x−y) 2
(B) (4x+y)(4x−y)
(C) (16x−y)(x+y)
(D) (8x−y)(2x+y)

Correct Answer: B

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Question (8)

QN009385

Factorise 9a 2 +24ab+16b 2 .

(A) (3a+4b) 2
(B) (9a+16b) 2
(C) (3a−4b) 2
(D) (9a+4b)(a+4b)

Correct Answer: A

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Question (9)

QN009386

Which identity is used in factorising 64−p 2 ?

(A) (a+b) 3
(B) (a−b) 2
(C) a 2 −b 2
(D) a 3 −b 3

Correct Answer: C

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Question (10)

QN009387

Factorise x 2 −18x+81.

(A) (x+9) 2
(B) (x−9) 2
(C) (x−18) 2
(D) (x−3)(x−27)

Correct Answer: B

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