Default Title

Question (11)

QN009388

Which factorisation is correct?

(A) 25a 2 −1=(25a−1)(a+1)
(B) 25a 2 −1=(5a−1) 2
(C) 25a 2 −1=(5a+1)(5a−1)
(D) 25a 2 −1=(25a+1)(a−1)

Correct Answer: C

Explanation:

Difference of squares formula is used.

Link:

Report Error

Question (12)

QN009389

Factorise 4x 2 +12xy+9y 2 .

(A) (2x+3y) 2
(B) (2x−3y) 2
(C) (4x+9y) 2
(D) (x+3y) 2

Correct Answer: A

Explanation:

Link:

Report Error

Question (13)

QN009390

Which of the following cannot be factorised using identities directly?

(A) a 2 −36
(B) x 2 +10x+25
(C) 9m 2 −24mn+16n 2
(D) x 2 +7x+10

Correct Answer: D

Explanation:

It is not a perfect square or difference of squares.

Link:

Report Error

Question (14)

QN009391

Factorise 81y 2 −49.

(A) (9y−7) 2
(B) (9y+7)(9y−7)
(C) (81y−49)(y+1)
(D) (9y+49)(9y−49)

Correct Answer: B

Explanation:

Link:

Report Error

Question (15)

QN009392

Which term is twice the product of a and b in (a+b) 2 ?

(A) a 2
(B) b 2
(C) 2ab
(D) a+b

Correct Answer: C

Explanation:

Middle term in the expansion is 2ab.

Link:

Report Error

Question (16)

QN009393

Factorise 121p 2 −22pq+q 2 .

(A) (11p+q) 2
(B) (11p−q) 2
(C) (121p−q) 2
(D) (11p−q)(11p+q)

Correct Answer: B

Explanation:

Link:

Report Error

Question (17)

QN009394

Which identity is represented by a square divided into four regions?

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

Correct Answer: A

Explanation:

Link:

Report Error

Question (18)

QN009395

Factorise 100−4x 2 .

(A) (10−2x) 2
(B) (5−x)(5+x)
(C) 4(5−x)(5+x)
(D) (10+x)(10−x)

Correct Answer: C

Explanation:

Link:

Report Error

Question (19)

QN009396

Factorise 36m 2 +60mn+25n 2 .

(A) (6m+5n) 2
(B) (6m−5n) 2
(C) (36m+25n) 2
(D) (3m+5n) 2

Correct Answer: A

Explanation:

This is a perfect square trinomial.

Link:

Report Error

Question (20)

QN009397

The expression a 2 −2ab+b 2 is equal to

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

Correct Answer: B

Explanation:

Link:

Report Error

Question (11)

Which factorisation is correct?

Explanation:

Link:

Question (12)

Factorise 4x 2 +12xy+9y 2 .

Explanation:

Link:

Question (13)

Which of the following cannot be factorised using identities directly?

Explanation:

Link:

Question (14)

Factorise 81y 2 −49.

Explanation:

Link:

Question (15)

Which term is twice the product of a and b in (a+b) 2 ?

Explanation:

Link:

Question (16)

Factorise 121p 2 −22pq+q 2 .

Explanation:

Link:

Question (17)

Which identity is represented by a square divided into four regions?

Explanation:

Link:

Question (18)

Factorise 100−4x 2 .

Explanation:

Link:

Question (19)

Factorise 36m 2 +60mn+25n 2 .

Explanation:

Link:

Question (20)

The expression a 2 −2ab+b 2 is equal to

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY