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350^2 - 320^2 =

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Joined: 20 Jul 2018
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350^2 - 320^2 =  [#permalink]

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New post 21 Oct 2018, 09:00
2
3
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

76% (00:51) correct 24% (01:13) wrong based on 54 sessions

HideShow timer Statistics

\(350^2 - 320^2 =\)

A) 900

B) 8100

C) 21100

D) 21000

E) 20100

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Re: 350^2 - 320^2 =  [#permalink]

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New post 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

Answer: E

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Re: 350^2 - 320^2 =  [#permalink]

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New post 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)
GMAT Club Bot
Re: 350^2 - 320^2 = &nbs [#permalink] 22 Oct 2018, 21:43
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350^2 - 320^2 =

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