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Question (21)

QN0019139

Which property helps expand (a+2)(b+4)?

(A) Commutative
(B) Associative
(C) Distributive
(D) Closure

Correct Answer: C

Explanation:

Distributive property

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Question (22)

QN0019140

A student expands (x+2)(x+5)=x^2+7x+10. Is it correct?

(A) Yes
(B) No, constant wrong
(C) No, middle term wrong
(D) No, first term wrong

Correct Answer: A

Explanation:

Correct expansion

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Question (23)

QN0019141

Expression x^2+7x+10 comes from

(A) (x+2)(x+5)
(B) (x+2)^2
(C) (x+5)^2
(D) (x-2)(x+5)

Correct Answer: A

Explanation:

Factorization

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Question (24)

QN0019142

A student forgets to multiply one term. Which property is violated?

(A) Closure
(B) Identity
(C) Distributive
(D) Inverse

Correct Answer: C

Explanation:

Distributive property error

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Question (25)

QN0019143

Correct squaring identity is

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

Correct Answer: B

Explanation:

Standard identity

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Question (26)

QN0019144

Common mistake in (a+b)^2=a^2+b^2 is missing

(A) 2ab term
(B) sign
(C) exponent
(D) coefficient of a^2

Correct Answer: A

Explanation:

Middle term missing

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Question (27)

QN0019145

Which expression contains only like terms?

(A) 4x^2+3x
(B) 5a^2+2ab
(C) 7m^3+2m^3
(D) a+b

Correct Answer: C

Explanation:

Same powers of m

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Question (28)

QN0019146

Simplify 7m^3+2m^3

(A) 9m^3
(B) 14m^6
(C) 9m^6
(D) 5m^3

Correct Answer: A

Explanation:

Add coefficients

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Question (29)

QN0019147

Which expression is already simplest?

(A) 4x+5x
(B) 3a^2+2a^2
(C) 5y^2+6y
(D) 7m+8m

Correct Answer: C

Explanation:

Unlike terms

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Question (30)

QN0019148

Combining a^2b and ab^2 is incorrect because

(A) coefficients differ
(B) signs differ
(C) unlike terms
(D) variables differ completely

Correct Answer: C

Explanation:

Different variable powers

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Question (21)

Which property helps expand (a+2)(b+4)?

Explanation:

Link:

Question (22)

A student expands (x+2)(x+5)=x^2+7x+10. Is it correct?

Explanation:

Link:

Question (23)

Expression x^2+7x+10 comes from

Explanation:

Link:

Question (24)

A student forgets to multiply one term. Which property is violated?

Explanation:

Link:

Question (25)

Correct squaring identity is

Explanation:

Link:

Question (26)

Common mistake in (a+b)^2=a^2+b^2 is missing

Explanation:

Link:

Question (27)

Which expression contains only like terms?

Explanation:

Link:

Question (28)

Simplify 7m^3+2m^3

Explanation:

Link:

Question (29)

Which expression is already simplest?

Explanation:

Link:

Question (30)

Combining a^2b and ab^2 is incorrect because

Explanation:

Link:

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