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

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

by jhavyom » Sun Nov 01, 2020 2:47 am
VJesus12 wrote: ↑
Tue Oct 20, 2020 5:26 am
 \(350^2-320^2=\)

A) \(900\)

B) \(8100\)

C) \(21100\)

D) \(21000\)

E) \(20100\)

Answer: E

Source: Manhattan GMAT
350^2-320^2
= (350+320)(350-320)
= 670 * 30
= 20100

Option E is the answer.
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Re: \(350^2-320^2=\)

by Scott@TargetTestPrep » Thu Nov 12, 2020 7:33 am
VJesus12 wrote: ↑
Tue Oct 20, 2020 5:26 am
 \(350^2-320^2=\)

A) \(900\)

B) \(8100\)

C) \(21100\)

D) \(21000\)

E) \(20100\)

Answer: E

Solution:


Note that 350^2 - 320^2 is a difference of squares, so it can be re-expressed as:


(350 - 320)(350 + 320)

30 x 670

20100

Answer: E

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