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Question (21)

QN0019099

Find ((50+3)(50-3)).

(A) 2491
(B) 2499
(C) 2500
(D) 2481

Correct Answer: A

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Question (22)

QN0019100

Expand ((a+b)^2).

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

Correct Answer: C

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Question (23)

QN0019101

Expand ((a-b)^2).

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

Correct Answer: A

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Question (24)

QN0019102

Expand ((7y+\frac{1}{2}z)^2).

(A) (49y^2+7yz+\frac14z^2)
(B) (49y^2+\frac14z^2)
(C) (14yz+\frac14z^2)
(D) (49y^2+14yz+\frac14z^2)

Correct Answer: A

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Question (25)

QN0019103

Expand ((3a-4b)^2).

(A) (9a^2-24ab+16b^2)
(B) (9a^2+24ab+16b^2)
(C) (9a^2-16b^2)
(D) (6a^2-24ab+16b^2)

Correct Answer: A

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Question (26)

QN0019104

Find ((2x+3)(2x-3)).

(A) (4x^2+9)
(B) (4x^2-9)
(C) (2x^2-9)
(D) (4x^2-6x-9)

Correct Answer: B

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Question (27)

QN0019105

Find ((8p+5)(8p-5)).

(A) (64p^2+25)
(B) (64p^2-25)
(C) (16p^2-25)
(D) (64p^2-10p-25)

Correct Answer: B

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Question (28)

QN0019106

The coefficient of (ab) in ((a+b)^2) is

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: B

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Question (29)

QN0019107

The constant term in ((x-6)^2) is

(A) -6
(B) 6
(C) 12
(D) 36

Correct Answer: D

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Question (30)

QN0019108

Which expression is equal to (a^2-b^2)?

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

Correct Answer: C

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