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Sub 505 (Easy)|   Arithmetic|      
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Kaczet
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350^2 - 320^2 = 21 Oct 2018, 10:00
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

5% (low)

Question Stats:

84% (01:01) correct 16% (01:25) wrong based on 174 sessions

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Date
Time
Result
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\(350^2 - 320^2 =\)

A) 900

B) 8100

C) 21100

D) 21000

E) 20100
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E
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BrentGMATPrepNow
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350^2 - 320^2 = Updated on: 08 Feb 2021, 15:42
Originally posted by BrentGMATPrepNow on 21 Oct 2018, 10:12.
Last edited by BrentGMATPrepNow on 08 Feb 2021, 15:42, edited 1 time in total.
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Kaczet
\(350^2 - 320^2 =\)

A) 900

B) 8100

C) 21100

D) 21000

E) 20100
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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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tam87
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350^2 - 320^2 = 22 Oct 2018, 22:43
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Kaczet
\(350^2 - 320^2 =\)

A) 900

B) 8100

C) 21100

D) 21000

E) 20100
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350^2 - 320^2 = 100(35^2 - 32^2) = 100 x 67 x 3 = 100 x 201 (option E)
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350^2 - 320^2 = 17 Aug 2022, 03:24
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