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# Which of the following is equivalent to 8a + (2ab − 4a)b − 4ab ?

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Math Expert
Joined: 02 Sep 2009
Posts: 53734
Which of the following is equivalent to 8a + (2ab − 4a)b − 4ab ?  [#permalink]

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19 Feb 2019, 21:59
00:00

Difficulty:

25% (medium)

Question Stats:

79% (01:58) correct 21% (02:36) wrong based on 42 sessions

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Which of the following is equivalent to $$8a + (2ab − 4a)b − 4ab$$ ?

A. $$2a(b − 2)^2$$

B. $$2a(b^2 − 2b + 2)$$

C. $$4a(b^2 − 2b + b)$$

D. $$4ab(1 − 2b)$$

E. $$a^2(2b + 2b^2)b$$

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Re: Which of the following is equivalent to 8a + (2ab − 4a)b − 4ab ?  [#permalink]

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20 Feb 2019, 00:39
Bunuel wrote:
Which of the following is equivalent to $$8a + (2ab − 4a)b − 4ab$$ ?

A. $$2a(b − 2)^2$$

B. $$2a(b^2 − 2b + 2)$$

C. $$4a(b^2 − 2b + b)$$

D. $$4ab(1 − 2b)$$

E. $$a^2(2b + 2b^2)b$$

solving

$$8a + (2ab − 4a)b − 4ab$$
we get
$$2a(b − 2)^2$$
IMO A
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Joined: 12 Sep 2017
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Re: Which of the following is equivalent to 8a + (2ab − 4a)b − 4ab ?  [#permalink]

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24 Feb 2019, 15:38
Hello everyone!

For this particular kind of questions, would you recommend to go backsolving?

Kinr regards!
Re: Which of the following is equivalent to 8a + (2ab − 4a)b − 4ab ?   [#permalink] 24 Feb 2019, 15:38
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