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350^2 - 320^2 =

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Manager
Joined: 20 Jul 2018
Posts: 75
WE: Corporate Finance (Investment Banking)

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21 Oct 2018, 09:00
2
3
00:00

Difficulty:

25% (medium)

Question Stats:

81% (01:07) correct 19% (01:37) wrong based on 68 sessions

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$$350^2 - 320^2 =$$

A) 900

B) 8100

C) 21100

D) 21000

E) 20100
CEO
Joined: 11 Sep 2015
Posts: 3440
Re: 350^2 - 320^2 =  [#permalink]

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21 Oct 2018, 09:12
Top Contributor
Kaczet wrote:
$$350^2 - 320^2 =$$

A) 900

B) 8100

C) 21100

D) 21000

E) 20100

Looks like a job for difference of squares factoring!
That is: x² - y² = (x + y)(x - y)

Likewise, 350² - 320² = (350 + 320)(350 - 320)
= (670)(30)
= 20,100

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Intern
Joined: 28 Mar 2018
Posts: 5
Re: 350^2 - 320^2 =  [#permalink]

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22 Oct 2018, 21:43
Kaczet wrote:
$$350^2 - 320^2 =$$

A) 900

B) 8100

C) 21100

D) 21000

E) 20100

350^2 - 320^2 = 100(35^2 - 32^2) = 100 x 67 x 3 = 100 x 201 (option E)
Re: 350^2 - 320^2 =   [#permalink] 22 Oct 2018, 21:43
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